feat(i18n): make language a user profile attribute (register/profile/login)

src/app/[locale]/login/page.tsx

@@ -3,6 +3,7 @@
 import { signIn } from "next-auth/react";
 import { useTranslations, useLocale } from "next-intl";
 import { Link, getPathname } from "@/i18n/navigation";
+import { Logo } from "@/components/ui/logo";
 
 export default function LoginPage() {
   const t = useTranslations("login");
@@ -25,10 +26,7 @@ export default function LoginPage() {
       <div className="relative z-10 w-full max-w-sm px-5 animate-in">
         {/* Logo mark */}
         <div className="flex justify-center mb-8">
-          <div className="relative h-12 w-12">
-            <div className="absolute inset-0 rounded-lg bg-accent/15" />
-            <div className="absolute inset-[5px] rounded-md bg-accent" />
-          </div>
+          <Logo className="h-14 w-auto text-accent" />
         </div>
 
         <div className="bg-surface-1 rounded-2xl border border-border p-8 shadow-2xl shadow-black/40">

src/app/[locale]/register/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useState, useRef, forwardRef } from "react";
-import { useTranslations } from "next-intl";
+import { useTranslations, useLocale } from "next-intl";
 import { useRouter, Link } from "@/i18n/navigation";
 import { Card } from "@/components/ui/card";
 
@@ -41,11 +41,17 @@ export default function RegisterPage() {
 
   const [accountType, setAccountType] = useState<AccountType | null>(null);
 
+  const locale = useLocale();
+
   const [form, setForm] = useState({
     companyName: "",
     givenName: "",
     familyName: "",
     email: "",
+    // Default to the language the register page is being viewed in;
+    // the user can change it below. This becomes their ZITADEL
+    // preferredLanguage and the UI language they land on after login.
+    preferredLanguage: locale,
   });
   const [state, setState] = useState<FormState>("idle");
   const [error, setError] = useState("");
@@ -94,6 +100,7 @@ export default function RegisterPage() {
         givenName: form.givenName,
         familyName: form.familyName,
         email: form.email,
+        preferredLanguage: form.preferredLanguage,
         isPersonal,
       };
       if (!isPersonal) {
@@ -295,6 +302,29 @@ export default function RegisterPage() {
                 />
               </div>
 
+              {/* Preferred language */}
+              <div>
+                <label className="block text-xs font-semibold uppercase tracking-wider text-text-muted mb-1.5">
+                  {t("languageLabel")}
+                </label>
+                <select
+                  name="preferredLanguage"
+                  value={form.preferredLanguage}
+                  onChange={(e) =>
+                    setForm((prev) => ({
+                      ...prev,
+                      preferredLanguage: e.target.value,
+                    }))
+                  }
+                  className="w-full px-3 py-2 bg-surface-2 border border-border rounded-lg text-sm text-text-primary focus:outline-none focus:ring-1 focus:ring-accent focus:border-accent transition-colors"
+                >
+                  <option value="de">Deutsch</option>
+                  <option value="en">English</option>
+                  <option value="fr">Français</option>
+                  <option value="it">Italiano</option>
+                </select>
+              </div>
+
               {error && (
                 <div className="text-xs text-red-400 bg-red-400/10 border border-red-400/20 rounded-lg px-3 py-2">
                   {error}

src/app/[locale]/settings/profile/page.tsx

@@ -30,13 +30,14 @@ export default async function ProfileSettingsPage() {
 
   const t = await getTranslations("settingsProfile");
 
-  let initial = { firstName: "", lastName: "", email: user.email };
+  let initial = { firstName: "", lastName: "", email: user.email, language: "" };
   try {
     const profile = await getHumanUserDetail(user.id);
     initial = {
       firstName: profile.givenName,
       lastName: profile.familyName,
       email: profile.email || user.email,
+      language: profile.preferredLanguage,
     };
   } catch (e) {
     // Identity provider unreachable: render the form with whatever

src/app/api/settings/profile/route.ts

@@ -26,6 +26,7 @@ import {
 const updateSchema = z.object({
   firstName: z.string().trim().min(1).max(100),
   lastName: z.string().trim().min(1).max(100),
+  language: z.enum(["de", "en", "fr", "it"]).optional(),
 });
 
 export async function GET() {
@@ -66,6 +67,7 @@ export async function PUT(request: Request) {
       userId: user.id,
       givenName: parsed.data.firstName,
       familyName: parsed.data.lastName,
+      preferredLanguage: parsed.data.language,
     });
     return NextResponse.json({
       displayName: result.displayName,

src/app/icon.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="5.5 3.69 38 38" role="img" aria-label="PieCed">
+  <rect x="5.5" y="3.69" width="38" height="38" rx="7" fill="#0B0F0E"/>
+  <polygon points="38.5,22.69 31.5,10.566 17.5,10.566 10.5,22.69 17.5,34.814 31.5,34.814"
+           fill="#10B981" stroke="#10B981" stroke-width="1.6" stroke-linejoin="round"/>
+</svg>

src/components/admin/admin-panel.tsx

@@ -5,6 +5,14 @@ import { useTranslations, useFormatter } from "next-intl";
 import type { PiecedTenant, TenantRequest } from "@/types";
 import { StatusBadge } from "@/components/ui/status-badge";
 import { Modal } from "@/components/ui/modal";
+import {
+  applyTableView,
+  nextSort,
+  SearchInput,
+  SortableTh,
+  Pagination,
+  type SortState,
+} from "@/components/admin/table-controls";
 import { formatDateTime, formatRelative } from "@/lib/format";
 import Link from "next/link";
 
@@ -53,6 +61,21 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
 
   // Shared
   const [error, setError] = useState("");
+
+  // Client-side table view state (search / sort / page) for each tab.
+  const [reqSearch, setReqSearch] = useState("");
+  const [reqSort, setReqSort] = useState<SortState>({
+    key: "created",
+    dir: "desc",
+  });
+  const [reqPage, setReqPage] = useState(1);
+
+  const [tenSearch, setTenSearch] = useState("");
+  const [tenSort, setTenSort] = useState<SortState>({
+    key: "created",
+    dir: "desc",
+  });
+  const [tenPage, setTenPage] = useState(1);
   // Action-scoped error — shown inside the active confirmation modal so
   // a failed approve/reject/delete surfaces next to the action that
   // caused it (and keeps the modal open), rather than as a detached
@@ -246,6 +269,53 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
 
   const pendingCount = requests.filter((r) => r.status === "pending").length;
 
+  // Derived table views: search → sort → paginate, applied client-side
+  // on top of the already-fetched lists.
+  const reqView = applyTableView(requests, {
+    search: reqSearch,
+    searchOf: (r) => [
+      r.companyName,
+      r.contactName,
+      r.contactEmail,
+      r.agentName,
+      r.tenantName,
+    ],
+    sort: reqSort,
+    sortOf: (r, key) =>
+      key === "company"
+        ? r.companyName || ""
+        : key === "status"
+          ? r.status || ""
+          : r.createdAt || "",
+    page: reqPage,
+  });
+
+  const tenView = applyTableView(tenants, {
+    search: tenSearch,
+    searchOf: (tn) => [
+      tn.metadata.name,
+      tn.spec.displayName,
+      tn.spec.agentName,
+    ],
+    sort: tenSort,
+    sortOf: (tn, key) =>
+      key === "name"
+        ? tn.spec.displayName || tn.metadata.name
+        : key === "phase"
+          ? tn.status?.phase || "Pending"
+          : tn.metadata.creationTimestamp || "",
+    page: tenPage,
+  });
+
+  const onReqSort = (key: string) => {
+    setReqSort((s) => nextSort(s, key));
+    setReqPage(1);
+  };
+  const onTenSort = (key: string) => {
+    setTenSort((s) => nextSort(s, key));
+    setTenPage(1);
+  };
+
   return (
     <>
       {/* Tab bar */}
@@ -315,20 +385,33 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
       {/* ───── REQUESTS TAB ───── */}
       {tab === "requests" && (
         <>
-          <div className="flex gap-1.5 mb-4 flex-wrap">
-            {FILTERS.map((f) => (
-              <button
-                key={f}
-                onClick={() => setFilter(f)}
-                className={`px-3 py-1 text-xs rounded-full transition-colors ${
-                  filter === f
-                    ? "bg-accent text-surface-0"
-                    : "bg-surface-2 text-text-muted hover:text-text-secondary border border-border"
-                }`}
-              >
-                {t(`filter_${f}`)}
-              </button>
-            ))}
+          <div className="flex items-center justify-between gap-3 mb-4 flex-wrap">
+            <div className="flex gap-1.5 flex-wrap">
+              {FILTERS.map((f) => (
+                <button
+                  key={f}
+                  onClick={() => {
+                    setFilter(f);
+                    setReqPage(1);
+                  }}
+                  className={`px-3 py-1 text-xs rounded-full transition-colors ${
+                    filter === f
+                      ? "bg-accent text-surface-0"
+                      : "bg-surface-2 text-text-muted hover:text-text-secondary border border-border"
+                  }`}
+                >
+                  {t(`filter_${f}`)}
+                </button>
+              ))}
+            </div>
+            <SearchInput
+              value={reqSearch}
+              onChange={(v) => {
+                setReqSearch(v);
+                setReqPage(1);
+              }}
+              placeholder={t("searchRequestsPlaceholder")}
+            />
           </div>
 
           {loadingRequests ? (
@@ -340,15 +423,22 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
             <div className="bg-surface-1 border border-border rounded-xl p-12 text-center">
               <p className="text-text-secondary text-sm">{t("noRequests")}</p>
             </div>
+          ) : reqView.total === 0 ? (
+            <div className="bg-surface-1 border border-border rounded-xl p-12 text-center">
+              <p className="text-text-secondary text-sm">{t("noMatches")}</p>
+            </div>
           ) : (
             <div className="bg-surface-1 border border-border rounded-xl overflow-hidden">
               <div className="overflow-x-auto">
                 <table className="w-full text-sm">
                   <thead>
                     <tr className="border-b border-border text-left">
-                      <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
-                        {t("company")}
-                      </th>
+                      <SortableTh
+                        label={t("company")}
+                        sortKey="company"
+                        sort={reqSort}
+                        onSort={onReqSort}
+                      />
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
                         {t("contact")}
                       </th>
@@ -358,19 +448,26 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted hidden lg:table-cell">
                         {t("packages")}
                       </th>
-                      <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
-                        {t("status")}
-                      </th>
-                      <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted hidden md:table-cell">
-                        {t("submitted")}
-                      </th>
+                      <SortableTh
+                        label={t("status")}
+                        sortKey="status"
+                        sort={reqSort}
+                        onSort={onReqSort}
+                      />
+                      <SortableTh
+                        label={t("submitted")}
+                        sortKey="created"
+                        sort={reqSort}
+                        onSort={onReqSort}
+                        className="hidden md:table-cell"
+                      />
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
                         {t("actions")}
                       </th>
                     </tr>
                   </thead>
                   <tbody>
-                    {requests.map((req) => (
+                    {reqView.paged.map((req) => (
                       <tr
                         key={req.id}
                         className="border-b border-border last:border-0 hover:bg-surface-2/50 transition-colors"
@@ -506,6 +603,12 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
                   </tbody>
                 </table>
               </div>
+              <Pagination
+                page={reqView.page}
+                totalPages={reqView.totalPages}
+                total={reqView.total}
+                onPage={setReqPage}
+              />
             </div>
           )}
         </>
@@ -543,6 +646,17 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
             />
           </div>
 
+          <div className="flex justify-end mb-4">
+            <SearchInput
+              value={tenSearch}
+              onChange={(v) => {
+                setTenSearch(v);
+                setTenPage(1);
+              }}
+              placeholder={t("searchTenantsPlaceholder")}
+            />
+          </div>
+
           {loadingTenants ? (
             <div className="bg-surface-1 border border-border rounded-xl p-12 text-center">
               <div className="h-5 w-5 border-2 border-accent border-t-transparent rounded-full animate-spin mx-auto mb-2" />
@@ -552,37 +666,51 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
             <div className="bg-surface-1 border border-border rounded-xl p-12 text-center">
               <p className="text-text-secondary text-sm">{t("noTenants")}</p>
             </div>
+          ) : tenView.total === 0 ? (
+            <div className="bg-surface-1 border border-border rounded-xl p-12 text-center">
+              <p className="text-text-secondary text-sm">{t("noMatches")}</p>
+            </div>
           ) : (
             <div className="bg-surface-1 border border-border rounded-xl overflow-hidden">
               <div className="overflow-x-auto">
                 <table className="w-full text-sm">
                   <thead>
                     <tr className="border-b border-border text-left">
-                      <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
-                        {t("name")}
-                      </th>
+                      <SortableTh
+                        label={t("name")}
+                        sortKey="name"
+                        sort={tenSort}
+                        onSort={onTenSort}
+                      />
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
                         {t("displayName")}
                       </th>
-                      <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
-                        {t("phase")}
-                      </th>
+                      <SortableTh
+                        label={t("phase")}
+                        sortKey="phase"
+                        sort={tenSort}
+                        onSort={onTenSort}
+                      />
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted hidden md:table-cell">
                         {t("packages")}
                       </th>
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted hidden md:table-cell">
                         {t("spendChf")}
                       </th>
-                      <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted hidden md:table-cell">
-                        {t("created")}
-                      </th>
+                      <SortableTh
+                        label={t("created")}
+                        sortKey="created"
+                        sort={tenSort}
+                        onSort={onTenSort}
+                        className="hidden md:table-cell"
+                      />
                       <th className="px-4 py-3 text-xs font-semibold uppercase tracking-wider text-text-muted">
                         {t("actions")}
                       </th>
                     </tr>
                   </thead>
                   <tbody>
-                    {tenants.map((tenant) => {
+                    {tenView.paged.map((tenant) => {
                       const tenantSpend =
                         health?.spend?.perTenant?.[tenant.metadata.name];
                       return (
@@ -680,6 +808,12 @@ export function AdminPanel({ initialTenants }: AdminPanelProps) {
                   </tbody>
                 </table>
               </div>
+              <Pagination
+                page={tenView.page}
+                totalPages={tenView.totalPages}
+                total={tenView.total}
+                onPage={setTenPage}
+              />
             </div>
           )}
         </>

src/components/admin/billing/new-invoice-form.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { Card } from "@/components/ui/card";
@@ -104,25 +104,14 @@ export function NewInvoiceForm({ orgs }: Props) {
           <label className="text-xs uppercase tracking-wider text-text-muted">
             {t("newInvoiceOrgLabel")}
           </label>
-          <select
+          <OrgCombobox
+            orgs={orgs}
             value={orgId}
-            onChange={(e) => onOrgChange(e.target.value)}
-            className="px-3 py-2 rounded-md border border-border bg-surface-2 text-sm"
-          >
-            <option value="">{t("newInvoiceOrgPlaceholder")}</option>
-            {orgs.map((o) => (
-              <option
-                key={o.zitadelOrgId}
-                value={o.zitadelOrgId}
-                disabled={!o.hasBillingAddress}
-              >
-                {o.companyName ?? o.zitadelOrgId}
-                {!o.hasBillingAddress
-                  ? ` (${t("newInvoiceOrgNoBilling")})`
-                  : ""}
-              </option>
-            ))}
-          </select>
+            onChange={onOrgChange}
+            placeholder={t("newInvoiceOrgPlaceholder")}
+            noBillingLabel={t("newInvoiceOrgNoBilling")}
+            noMatchesLabel={t("newInvoiceOrgNoMatches")}
+          />
           {selected && !selected.hasBillingAddress && (
             <p className="text-xs text-error mt-1">
               {t("newInvoiceOrgBillingMissing")}
@@ -164,3 +153,138 @@ export function NewInvoiceForm({ orgs }: Props) {
     </Card>
   );
 }
+
+/**
+ * Searchable single-select for the billing org. Replaces a plain
+ * <select> that would become unusable once the customer list grows:
+ * type to filter by company name or org id, arrow keys to move, Enter
+ * to pick. Orgs without a billing snapshot stay selectable but are
+ * flagged — selecting one surfaces the existing "billing missing"
+ * warning and keeps the submit button disabled.
+ */
+function OrgCombobox({
+  orgs,
+  value,
+  onChange,
+  placeholder,
+  noBillingLabel,
+  noMatchesLabel,
+}: {
+  orgs: OrgEntry[];
+  value: string;
+  onChange: (orgId: string) => void;
+  placeholder: string;
+  noBillingLabel: string;
+  noMatchesLabel: string;
+}) {
+  const [open, setOpen] = useState(false);
+  const [query, setQuery] = useState("");
+  const [hi, setHi] = useState(0);
+  const ref = useRef<HTMLDivElement>(null);
+
+  const selected = orgs.find((o) => o.zitadelOrgId === value) || null;
+  const display = selected ? selected.companyName ?? selected.zitadelOrgId : "";
+
+  // Close on outside click so the dropdown doesn't linger.
+  useEffect(() => {
+    const onDoc = (e: MouseEvent) => {
+      if (ref.current && !ref.current.contains(e.target as Node)) {
+        setOpen(false);
+      }
+    };
+    document.addEventListener("mousedown", onDoc);
+    return () => document.removeEventListener("mousedown", onDoc);
+  }, []);
+
+  const q = query.trim().toLowerCase();
+  const filtered = q
+    ? orgs.filter(
+        (o) =>
+          (o.companyName ?? "").toLowerCase().includes(q) ||
+          o.zitadelOrgId.toLowerCase().includes(q)
+      )
+    : orgs;
+
+  const choose = (o: OrgEntry) => {
+    onChange(o.zitadelOrgId);
+    setOpen(false);
+    setQuery("");
+  };
+
+  return (
+    <div ref={ref} className="relative">
+      <input
+        type="text"
+        value={open ? query : display}
+        onChange={(e) => {
+          setQuery(e.target.value);
+          setOpen(true);
+          setHi(0);
+        }}
+        onFocus={() => {
+          setOpen(true);
+          setQuery("");
+        }}
+        onKeyDown={(e) => {
+          if (e.key === "ArrowDown") {
+            e.preventDefault();
+            setOpen(true);
+            setHi((h) => Math.min(h + 1, filtered.length - 1));
+          } else if (e.key === "ArrowUp") {
+            e.preventDefault();
+            setHi((h) => Math.max(h - 1, 0));
+          } else if (e.key === "Enter") {
+            e.preventDefault();
+            if (open && filtered[hi]) choose(filtered[hi]);
+          } else if (e.key === "Escape") {
+            setOpen(false);
+          }
+        }}
+        placeholder={placeholder}
+        role="combobox"
+        aria-expanded={open}
+        aria-autocomplete="list"
+        className="w-full px-3 py-2 rounded-md border border-border bg-surface-2 text-sm text-text-primary placeholder:text-text-muted focus:outline-none focus:ring-1 focus:ring-accent focus:border-accent transition-colors"
+      />
+      {open && (
+        <ul
+          role="listbox"
+          className="absolute z-20 mt-1 max-h-64 w-full overflow-auto rounded-md border border-border bg-surface-1 shadow-xl py-1"
+        >
+          {filtered.length === 0 ? (
+            <li className="px-3 py-2 text-xs text-text-muted">
+              {noMatchesLabel}
+            </li>
+          ) : (
+            filtered.map((o, i) => (
+              <li
+                key={o.zitadelOrgId}
+                role="option"
+                aria-selected={o.zitadelOrgId === value}
+                onMouseEnter={() => setHi(i)}
+                // mousedown (not click) so selection runs before the
+                // input's blur closes the list.
+                onMouseDown={(e) => {
+                  e.preventDefault();
+                  choose(o);
+                }}
+                className={`px-3 py-2 text-sm cursor-pointer flex items-center justify-between gap-2 ${
+                  i === hi ? "bg-surface-3" : "hover:bg-surface-2"
+                }`}
+              >
+                <span className="truncate text-text-primary">
+                  {o.companyName ?? o.zitadelOrgId}
+                </span>
+                {!o.hasBillingAddress && (
+                  <span className="text-[10px] text-error shrink-0">
+                    {noBillingLabel}
+                  </span>
+                )}
+              </li>
+            ))
+          )}
+        </ul>
+      )}
+    </div>
+  );
+}

src/components/admin/table-controls.tsx

@@ -0,0 +1,190 @@
+"use client";
+
+import { useTranslations } from "next-intl";
+
+/**
+ * Shared client-side table controls for the admin panel.
+ *
+ * The admin tables (requests, tenants) load their full result set into
+ * state already, so search/sort/pagination are applied client-side on
+ * top — no new API surface. At pilot scale the lists are small enough
+ * that filtering/sorting in memory is free; if they grow past a few
+ * hundred rows this is the seam to move server-side (the page/sort
+ * state would become query params).
+ */
+
+export const PAGE_SIZE = 15;
+
+export interface SortState {
+  key: string;
+  dir: "asc" | "desc";
+}
+
+/**
+ * Filter → sort → paginate a list. Pure function, called during render.
+ * `searchOf` returns the haystack strings for a row; `sortOf` returns
+ * the comparable value for the active sort key (string or number).
+ */
+export function applyTableView<T>(
+  items: T[],
+  opts: {
+    search: string;
+    searchOf: (item: T) => (string | null | undefined)[];
+    sort: SortState;
+    sortOf: (item: T, key: string) => string | number;
+    page: number;
+    pageSize?: number;
+  }
+): { paged: T[]; total: number; totalPages: number; page: number } {
+  const pageSize = opts.pageSize ?? PAGE_SIZE;
+
+  const q = opts.search.trim().toLowerCase();
+  const filtered = q
+    ? items.filter((it) =>
+        opts
+          .searchOf(it)
+          .some((v) => (v ?? "").toString().toLowerCase().includes(q))
+      )
+    : items;
+
+  const sorted = [...filtered].sort((a, b) => {
+    const av = opts.sortOf(a, opts.sort.key);
+    const bv = opts.sortOf(b, opts.sort.key);
+    const cmp =
+      typeof av === "number" && typeof bv === "number"
+        ? av - bv
+        : String(av).localeCompare(String(bv));
+    return opts.sort.dir === "asc" ? cmp : -cmp;
+  });
+
+  const total = sorted.length;
+  const totalPages = Math.max(1, Math.ceil(total / pageSize));
+  const page = Math.min(Math.max(1, opts.page), totalPages);
+  const paged = sorted.slice((page - 1) * pageSize, page * pageSize);
+
+  return { paged, total, totalPages, page };
+}
+
+/** Toggle helper: same key flips direction, new key starts ascending. */
+export function nextSort(current: SortState, key: string): SortState {
+  if (current.key === key) {
+    return { key, dir: current.dir === "asc" ? "desc" : "asc" };
+  }
+  return { key, dir: "asc" };
+}
+
+export function SearchInput({
+  value,
+  onChange,
+  placeholder,
+}: {
+  value: string;
+  onChange: (v: string) => void;
+  placeholder: string;
+}) {
+  return (
+    <div className="relative">
+      <svg
+        className="absolute left-2.5 top-1/2 -translate-y-1/2 h-4 w-4 text-text-muted pointer-events-none"
+        fill="none"
+        viewBox="0 0 24 24"
+        stroke="currentColor"
+        strokeWidth={1.75}
+        aria-hidden="true"
+      >
+        <path
+          strokeLinecap="round"
+          strokeLinejoin="round"
+          d="M21 21l-4.35-4.35M17 11a6 6 0 11-12 0 6 6 0 0112 0z"
+        />
+      </svg>
+      <input
+        type="search"
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        placeholder={placeholder}
+        className="w-full sm:w-72 pl-8 pr-3 py-2 bg-surface-2 border border-border rounded-lg text-sm text-text-primary placeholder:text-text-muted focus:outline-none focus:ring-1 focus:ring-accent focus:border-accent transition-colors"
+      />
+    </div>
+  );
+}
+
+export function SortableTh({
+  label,
+  sortKey,
+  sort,
+  onSort,
+  className,
+}: {
+  label: string;
+  sortKey: string;
+  sort: SortState;
+  onSort: (key: string) => void;
+  className?: string;
+}) {
+  const active = sort.key === sortKey;
+  return (
+    <th className={`px-4 py-3 ${className ?? ""}`}>
+      <button
+        type="button"
+        onClick={() => onSort(sortKey)}
+        className={`inline-flex items-center gap-1 text-xs font-semibold uppercase tracking-wider transition-colors cursor-pointer ${
+          active ? "text-text-secondary" : "text-text-muted hover:text-text-secondary"
+        }`}
+        aria-sort={active ? (sort.dir === "asc" ? "ascending" : "descending") : "none"}
+      >
+        {label}
+        <span className="inline-block w-2 text-[9px]" aria-hidden="true">
+          {active ? (sort.dir === "asc" ? "▲" : "▼") : ""}
+        </span>
+      </button>
+    </th>
+  );
+}
+
+export function Pagination({
+  page,
+  totalPages,
+  total,
+  onPage,
+}: {
+  page: number;
+  totalPages: number;
+  total: number;
+  onPage: (p: number) => void;
+}) {
+  const t = useTranslations("admin");
+  if (totalPages <= 1) {
+    return (
+      <div className="flex items-center justify-end px-4 py-2.5 border-t border-border text-xs text-text-muted">
+        <span>{t("paginationCount", { total })}</span>
+      </div>
+    );
+  }
+  return (
+    <div className="flex items-center justify-between px-4 py-2.5 border-t border-border text-xs text-text-muted gap-3">
+      <span className="tabular-nums">{t("paginationCount", { total })}</span>
+      <div className="flex items-center gap-2">
+        <button
+          type="button"
+          onClick={() => onPage(page - 1)}
+          disabled={page <= 1}
+          className="px-2.5 py-1 rounded-md border border-border hover:bg-surface-2 disabled:opacity-40 disabled:cursor-not-allowed transition-colors cursor-pointer"
+        >
+          {t("paginationPrev")}
+        </button>
+        <span className="tabular-nums">
+          {t("paginationPage", { page, total: totalPages })}
+        </span>
+        <button
+          type="button"
+          onClick={() => onPage(page + 1)}
+          disabled={page >= totalPages}
+          className="px-2.5 py-1 rounded-md border border-border hover:bg-surface-2 disabled:opacity-40 disabled:cursor-not-allowed transition-colors cursor-pointer"
+        >
+          {t("paginationNext")}
+        </button>
+      </div>
+    </div>
+  );
+}

src/components/layout/nav-shell.tsx

@@ -8,6 +8,7 @@ import { Link } from "@/i18n/navigation";
 import { SessionProvider } from "next-auth/react";
 import type { Session } from "next-auth";
 import { LanguageSwitcher } from "@/components/ui/language-switcher";
+import { Logo } from "@/components/ui/logo";
 
 function NavBar() {
   const t = useTranslations("common");
@@ -79,11 +80,8 @@ function NavBar() {
         {/* Logo / brand */}
         <div className="flex items-center gap-6">
           <Link href="/dashboard" className="flex items-center gap-2.5 group">
-            {/* Geometric mark */}
-            <div className="relative h-7 w-7">
-              <div className="absolute inset-0 rounded-md bg-accent/20 group-hover:bg-accent/30 transition-colors" />
-              <div className="absolute inset-[3px] rounded-sm bg-accent" />
-            </div>
+            {/* Brand mark */}
+            <Logo className="h-7 w-auto text-accent group-hover:text-accent-dim transition-colors" />
             <span className="font-display text-base font-semibold tracking-tight text-text-primary">
               {t("appName")}
             </span>

src/components/settings/profile-form.tsx

@@ -2,7 +2,7 @@
 
 import { useState } from "react";
 import { useSession } from "next-auth/react";
-import { useTranslations } from "next-intl";
+import { useTranslations, useLocale } from "next-intl";
 import { Card } from "@/components/ui/card";
 
 interface Props {
@@ -10,6 +10,8 @@ interface Props {
     firstName: string;
     lastName: string;
     email: string;
+    /** Current ZITADEL preferredLanguage; "" if never set. */
+    language: string;
   };
   /**
    * Personal-account flag. Drives a small hint about how the ZITADEL
@@ -43,10 +45,15 @@ interface Props {
  */
 export function ProfileSettingsForm({ initial, isPersonal, orgName }: Props) {
   const t = useTranslations("settingsProfile");
+  const locale = useLocale();
   const { update } = useSession();
   const [form, setForm] = useState({
     firstName: initial.firstName,
     lastName: initial.lastName,
+    // Fall back to the current UI locale when the profile has no stored
+    // preference yet (older accounts), so the selector shows something
+    // sensible rather than blank.
+    language: initial.language || locale,
   });
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState<string | null>(null);
@@ -67,6 +74,7 @@ export function ProfileSettingsForm({ initial, isPersonal, orgName }: Props) {
         body: JSON.stringify({
           firstName: form.firstName.trim(),
           lastName: form.lastName.trim(),
+          language: form.language,
         }),
       });
       const data = await res.json().catch(() => ({}));
@@ -79,15 +87,15 @@ export function ProfileSettingsForm({ initial, isPersonal, orgName }: Props) {
       // to session.user.name. No re-login needed.
       await update({ name: data.displayName });
       setSavedFlash(true);
-      // Force a full reload so EVERY server-rendered component picks
-      // up the new session cookie immediately — router.refresh() only
-      // re-runs the current route's server components, leaving the
-      // nav-shell (rendered higher in the tree) and other cached
-      // segments showing the old name until the user navigates.
-      // The 800ms delay lets the "Saved" flash render briefly before
-      // the page reloads, so the user gets visible feedback.
+      // If the language changed, land the user on the new locale (a
+      // full navigation so every server-rendered surface re-renders in
+      // the new language). Otherwise just reload so the new name
+      // propagates. The 800ms delay lets the "Saved" flash show first.
+      const localeChanged = form.language && form.language !== locale;
+      const target = localeChanged ? localePath(form.language) : null;
       setTimeout(() => {
-        window.location.reload();
+        if (target) window.location.assign(target);
+        else window.location.reload();
       }, 800);
     } catch (e: any) {
       setError(e?.message ?? String(e));
@@ -132,6 +140,20 @@ export function ProfileSettingsForm({ initial, isPersonal, orgName }: Props) {
             className="w-full px-3 py-2 rounded-md bg-surface-2 border border-border text-sm text-text-muted cursor-not-allowed"
           />
         </Field>
+        <Field label={t("languageLabel")} hint={t("languageHint")}>
+          <select
+            value={form.language}
+            onChange={(e) =>
+              setForm((f) => ({ ...f, language: e.target.value }))
+            }
+            className="w-full px-3 py-2 rounded-md bg-surface-2 border border-border focus:border-accent focus:outline-none text-sm"
+          >
+            <option value="de">Deutsch</option>
+            <option value="en">English</option>
+            <option value="fr">Français</option>
+            <option value="it">Italiano</option>
+          </select>
+        </Field>
         {/* Personal vs company hint. Personals get the
             "this won't change your invoice name" warning since their
             ZITADEL name and their invoice identity are intentionally
@@ -163,6 +185,15 @@ export function ProfileSettingsForm({ initial, isPersonal, orgName }: Props) {
   );
 }
 
+// Build the as-needed-prefixed path for a target locale from the
+// current URL (default locale `de` is unprefixed). Client-only — uses
+// window; called from the save handler.
+function localePath(lang: string): string {
+  const p =
+    window.location.pathname.replace(/^\/(de|fr|it|en)(?=\/|$)/, "") || "/";
+  return lang === "de" ? p : `/${lang}${p === "/" ? "" : p}`;
+}
+
 function Field({
   label,
   required,

src/components/tenants/connect-panel.tsx

@@ -139,7 +139,7 @@ export function ConnectPanel({
         <button
           type="button"
           onClick={reopen}
-          className="text-xs font-medium text-accent hover:text-accent-dim transition-colors cursor-pointer"
+          className="shrink-0 inline-flex items-center rounded-md border border-border px-2.5 py-1 text-xs font-medium text-accent hover:bg-surface-2 hover:border-accent/40 transition-colors cursor-pointer"
         >
           {t("show")}
         </button>
@@ -156,7 +156,7 @@ export function ConnectPanel({
         <button
           type="button"
           onClick={dismiss}
-          className="shrink-0 inline-flex items-center gap-1 text-xs font-medium text-text-muted hover:text-text-secondary transition-colors cursor-pointer"
+          className="shrink-0 inline-flex items-center gap-1.5 rounded-md border border-accent/40 bg-accent/10 px-2.5 py-1 text-xs font-medium text-accent hover:bg-accent/20 hover:border-accent/60 transition-colors cursor-pointer"
         >
           <svg
             className="h-3.5 w-3.5"

src/components/ui/logo.tsx

@@ -0,0 +1,83 @@
+/**
+ * PieCed honeycomb mark.
+ *
+ * Six flat-top hexagons: H1/H4 solid, H2/H3 outline, H5/H6 partial.
+ * All strokes/fills use `currentColor` so the mark inherits its colour
+ * from the surrounding text colour (e.g. `text-accent`) and adapts to
+ * hover/theme without editing the SVG. Original brand emerald is
+ * #10B981, which the accent token matches.
+ *
+ * viewBox is portrait (70×106); size it by height and let width follow
+ * (`h-7 w-auto`).
+ */
+export function Logo({
+  className,
+  title = "PieCed IT",
+}: {
+  className?: string;
+  title?: string;
+}) {
+  return (
+    <svg
+      viewBox="0 0 70 106"
+      className={className}
+      role="img"
+      aria-label={title}
+      fill="none"
+    >
+      <title>{title}</title>
+      {/* H1 — solid, top-left */}
+      <polygon
+        points="38.5,22.69 31.5,10.566 17.5,10.566 10.5,22.69 17.5,34.814 31.5,34.814"
+        fill="currentColor"
+        stroke="currentColor"
+        strokeWidth="1.6"
+        strokeLinejoin="round"
+      />
+      {/* H2 — outline, upper-right */}
+      <polygon
+        points="59.5,34.814 52.5,22.69 38.5,22.69 31.5,34.814 38.5,46.938 52.5,46.938"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="1.8"
+        strokeLinejoin="round"
+        strokeLinecap="round"
+      />
+      {/* H3 — outline, mid-left */}
+      <polygon
+        points="38.5,46.938 31.5,34.814 17.5,34.814 10.5,46.938 17.5,59.062 31.5,59.062"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="1.8"
+        strokeLinejoin="round"
+        strokeLinecap="round"
+      />
+      {/* H4 — solid, mid-right */}
+      <polygon
+        points="59.5,59.062 52.5,46.938 38.5,46.938 31.5,59.062 38.5,71.186 52.5,71.186"
+        fill="currentColor"
+        stroke="currentColor"
+        strokeWidth="1.6"
+        strokeLinejoin="round"
+      />
+      {/* H5 — partial, lower-left */}
+      <polyline
+        points="31.5,83.31 38.5,71.186 31.5,59.062 17.5,59.062 10.5,71.186"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="1.8"
+        strokeLinejoin="round"
+        strokeLinecap="round"
+      />
+      {/* H6 — partial, lower-right */}
+      <polyline
+        points="59.5,83.31 52.5,71.186 38.5,71.186 31.5,83.31 38.5,95.434"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="1.8"
+        strokeLinejoin="round"
+        strokeLinecap="round"
+      />
+    </svg>
+  );
+}

src/lib/auth.ts

@@ -111,6 +111,13 @@ export const authConfig: NextAuthConfig = {
         if (typeof profile.sub === "string") {
           token.sub = profile.sub;
         }
+        // Capture the user's preferred language (OIDC `locale` claim,
+        // mapped from ZITADEL preferredLanguage). Read once at sign-in;
+        // middleware uses it to land the user on their language a
+        // single time per login. Stored as-is and validated downstream.
+        if (typeof claims.locale === "string") {
+          token.locale = claims.locale;
+        }
       }
       return token;
     },
@@ -140,6 +147,7 @@ export const authConfig: NextAuthConfig = {
         // both legacy " (Personal)" suffix and current "personal-{8hex}"
         // opaque names.
         isPersonal: isPersonalOrgName(orgName),
+        locale: (token.locale as string | undefined) ?? undefined,
       };
       (session as any).platformUser = sessionUser;
       // Also overwrite session.user so any client-side code that uses

src/lib/zitadel.ts

@@ -569,6 +569,7 @@ export async function updateHumanUserProfile(params: {
   userId: string;
   givenName: string;
   familyName: string;
+  preferredLanguage?: string;
 }): Promise<UpdateHumanUserProfileResult> {
   const path = `/v2/users/human/${encodeURIComponent(params.userId)}`;
   // Compose the displayName ourselves so ZITADEL stores something
@@ -579,13 +580,22 @@ export async function updateHumanUserProfile(params: {
   type ZitadelUpdateResponse = {
     details?: { changeDate?: string };
   };
-  await zitadelFetch<ZitadelUpdateResponse>(path, "PUT", {
-    profile: {
-      givenName: params.givenName,
-      familyName: params.familyName,
-      displayName,
-    },
-  });
+  // preferredLanguage is part of the same `profile` block; include it
+  // only when provided so a name-only update doesn't clobber it.
+  const profile: {
+    givenName: string;
+    familyName: string;
+    displayName: string;
+    preferredLanguage?: string;
+  } = {
+    givenName: params.givenName,
+    familyName: params.familyName,
+    displayName,
+  };
+  if (params.preferredLanguage) {
+    profile.preferredLanguage = params.preferredLanguage;
+  }
+  await zitadelFetch<ZitadelUpdateResponse>(path, "PUT", { profile });
   // Re-fetch the user to read back the canonical displayName ZITADEL
   // committed. Should match what we sent, but reading from the source
   // of truth catches any sanitization ZITADEL might apply.
@@ -607,6 +617,8 @@ export interface HumanUserDetail {
   familyName: string;
   displayName: string;
   email: string;
+  /** ZITADEL profile preferredLanguage (e.g. "de"); "" if unset. */
+  preferredLanguage: string;
 }
 
 export async function getHumanUserDetail(
@@ -620,6 +632,7 @@ export async function getHumanUserDetail(
           givenName?: string;
           familyName?: string;
           displayName?: string;
+          preferredLanguage?: string;
         };
         email?: { email?: string };
       };
@@ -636,5 +649,6 @@ export async function getHumanUserDetail(
     familyName: human?.profile?.familyName ?? "",
     displayName: human?.profile?.displayName ?? "",
     email: human?.email?.email ?? "",
+    preferredLanguage: human?.profile?.preferredLanguage ?? "",
   };
 }

src/messages/de.json

@@ -48,7 +48,8 @@
     "personalCardTitle": "Privat",
     "personalCardDescription": "Für Sie persönlich.",
     "companyCardTitle": "Unternehmen",
-    "companyCardDescription": "Für Ihr Unternehmen oder Team."
+    "companyCardDescription": "Für Ihr Unternehmen oder Team.",
+    "languageLabel": "Sprache"
   },
   "onboarding": {
     "loading": "Status wird geladen…",
@@ -436,7 +437,14 @@
     "approveTitle": "Anfrage genehmigen?",
     "approveWarning": "Dadurch wird die Infrastruktur des Mandanten bereitgestellt, die Einrichtungsgebühr berechnet und der Kunde benachrichtigt. Bitte prüfen Sie die Angaben, bevor Sie fortfahren.",
     "approveReapproveWarning": "Dies genehmigt eine zuvor abgelehnte Anfrage erneut: Die Infrastruktur des Mandanten wird bereitgestellt, die Einrichtungsgebühr berechnet und der Kunde benachrichtigt.",
-    "confirmApprove": "Genehmigen & bereitstellen"
+    "confirmApprove": "Genehmigen & bereitstellen",
+    "searchRequestsPlaceholder": "Anfragen suchen…",
+    "searchTenantsPlaceholder": "Mandanten suchen…",
+    "paginationPrev": "Zurück",
+    "paginationNext": "Weiter",
+    "paginationPage": "Seite {page} von {total}",
+    "paginationCount": "{total} gesamt",
+    "noMatches": "Keine Treffer."
   },
   "channelUsers": {
     "title": "Autorisierte Benutzer",
@@ -847,7 +855,8 @@
     "orgsPayByInvoiceOn": "ein",
     "orgsPayByInvoiceOff": "aus",
     "orgsAutoChargeOn": "ein",
-    "orgsAutoChargeOff": "aus"
+    "orgsAutoChargeOff": "aus",
+    "newInvoiceOrgNoMatches": "Keine passenden Kunden."
   },
   "skillCostDialog": {
     "title": "Aktivierungskosten bestätigen",
@@ -986,7 +995,9 @@
     "saveChanges": "Änderungen speichern",
     "saving": "Speichern…",
     "saved": "Gespeichert.",
-    "missingRequired": "Vor- und Nachname sind erforderlich."
+    "missingRequired": "Vor- und Nachname sind erforderlich.",
+    "languageLabel": "Sprache",
+    "languageHint": "Wird nach der Anmeldung als Ihre Oberflächensprache verwendet."
   },
   "errors": {
     "title": "Etwas ist schiefgelaufen",

src/messages/en.json

@@ -48,7 +48,8 @@
     "personalCardTitle": "Personal",
     "personalCardDescription": "For yourself.",
     "companyCardTitle": "Company",
-    "companyCardDescription": "For your business or team."
+    "companyCardDescription": "For your business or team.",
+    "languageLabel": "Language"
   },
   "onboarding": {
     "loading": "Loading status…",
@@ -436,7 +437,14 @@
     "approveTitle": "Approve request?",
     "approveWarning": "This provisions the tenant's infrastructure, charges the setup fee, and notifies the customer. Check the request details are correct before continuing.",
     "approveReapproveWarning": "This re-approves a previously rejected request: it provisions the tenant's infrastructure, charges the setup fee, and notifies the customer.",
-    "confirmApprove": "Approve & provision"
+    "confirmApprove": "Approve & provision",
+    "searchRequestsPlaceholder": "Search requests…",
+    "searchTenantsPlaceholder": "Search tenants…",
+    "paginationPrev": "Previous",
+    "paginationNext": "Next",
+    "paginationPage": "Page {page} of {total}",
+    "paginationCount": "{total} total",
+    "noMatches": "No matches."
   },
   "channelUsers": {
     "title": "Authorized Users",
@@ -847,7 +855,8 @@
     "orgsPayByInvoiceOn": "on",
     "orgsPayByInvoiceOff": "off",
     "orgsAutoChargeOn": "on",
-    "orgsAutoChargeOff": "off"
+    "orgsAutoChargeOff": "off",
+    "newInvoiceOrgNoMatches": "No matching customers."
   },
   "skillCostDialog": {
     "title": "Confirm activation cost",
@@ -986,7 +995,9 @@
     "saveChanges": "Save changes",
     "saving": "Saving…",
     "saved": "Saved.",
-    "missingRequired": "First and last name are required."
+    "missingRequired": "First and last name are required.",
+    "languageLabel": "Language",
+    "languageHint": "Used as your interface language after you sign in."
   },
   "errors": {
     "title": "Something went wrong",

src/messages/fr.json

@@ -48,7 +48,8 @@
     "personalCardTitle": "Particulier",
     "personalCardDescription": "Pour vous.",
     "companyCardTitle": "Entreprise",
-    "companyCardDescription": "Pour votre entreprise ou équipe."
+    "companyCardDescription": "Pour votre entreprise ou équipe.",
+    "languageLabel": "Langue"
   },
   "onboarding": {
     "loading": "Chargement du statut…",
@@ -436,7 +437,14 @@
     "approveTitle": "Approuver la demande ?",
     "approveWarning": "Cela provisionne l'infrastructure du locataire, facture les frais d'installation et notifie le client. Vérifiez l'exactitude des détails de la demande avant de continuer.",
     "approveReapproveWarning": "Ceci réapprouve une demande précédemment rejetée : l'infrastructure du locataire est provisionnée, les frais d'installation sont facturés et le client est notifié.",
-    "confirmApprove": "Approuver et provisionner"
+    "confirmApprove": "Approuver et provisionner",
+    "searchRequestsPlaceholder": "Rechercher des demandes…",
+    "searchTenantsPlaceholder": "Rechercher des locataires…",
+    "paginationPrev": "Précédent",
+    "paginationNext": "Suivant",
+    "paginationPage": "Page {page} sur {total}",
+    "paginationCount": "{total} au total",
+    "noMatches": "Aucun résultat."
   },
   "channelUsers": {
     "title": "Utilisateurs autorisés",
@@ -847,7 +855,8 @@
     "orgsPayByInvoiceOn": "actif",
     "orgsPayByInvoiceOff": "inactif",
     "orgsAutoChargeOn": "actif",
-    "orgsAutoChargeOff": "inactif"
+    "orgsAutoChargeOff": "inactif",
+    "newInvoiceOrgNoMatches": "Aucun client correspondant."
   },
   "skillCostDialog": {
     "title": "Confirmer le coût d'activation",
@@ -986,7 +995,9 @@
     "saveChanges": "Enregistrer les modifications",
     "saving": "Enregistrement…",
     "saved": "Enregistré.",
-    "missingRequired": "Le prénom et le nom sont obligatoires."
+    "missingRequired": "Le prénom et le nom sont obligatoires.",
+    "languageLabel": "Langue",
+    "languageHint": "Utilisée comme langue d'interface après votre connexion."
   },
   "errors": {
     "title": "Une erreur est survenue",

src/messages/it.json

@@ -48,7 +48,8 @@
     "personalCardTitle": "Privato",
     "personalCardDescription": "Per lei.",
     "companyCardTitle": "Azienda",
-    "companyCardDescription": "Per la sua azienda o team."
+    "companyCardDescription": "Per la sua azienda o team.",
+    "languageLabel": "Lingua"
   },
   "onboarding": {
     "loading": "Caricamento stato…",
@@ -436,7 +437,14 @@
     "approveTitle": "Approvare la richiesta?",
     "approveWarning": "Questa operazione effettua il provisioning dell'infrastruttura del tenant, addebita il costo di attivazione e notifica il cliente. Verifica che i dettagli della richiesta siano corretti prima di continuare.",
     "approveReapproveWarning": "Questo riapprova una richiesta precedentemente rifiutata: effettua il provisioning dell'infrastruttura del tenant, addebita il costo di attivazione e notifica il cliente.",
-    "confirmApprove": "Approva e avvia provisioning"
+    "confirmApprove": "Approva e avvia provisioning",
+    "searchRequestsPlaceholder": "Cerca richieste…",
+    "searchTenantsPlaceholder": "Cerca tenant…",
+    "paginationPrev": "Precedente",
+    "paginationNext": "Successivo",
+    "paginationPage": "Pagina {page} di {total}",
+    "paginationCount": "{total} totali",
+    "noMatches": "Nessun risultato."
   },
   "channelUsers": {
     "title": "Utenti autorizzati",
@@ -847,7 +855,8 @@
     "orgsPayByInvoiceOn": "attivo",
     "orgsPayByInvoiceOff": "disattivo",
     "orgsAutoChargeOn": "attivo",
-    "orgsAutoChargeOff": "disattivo"
+    "orgsAutoChargeOff": "disattivo",
+    "newInvoiceOrgNoMatches": "Nessun cliente corrispondente."
   },
   "skillCostDialog": {
     "title": "Confermi costi di attivazione",
@@ -986,7 +995,9 @@
     "saveChanges": "Salvi modifiche",
     "saving": "Salvataggio…",
     "saved": "Salvato.",
-    "missingRequired": "Nome e cognome sono obbligatori."
+    "missingRequired": "Nome e cognome sono obbligatori.",
+    "languageLabel": "Lingua",
+    "languageHint": "Usata come lingua dell'interfaccia dopo l'accesso."
   },
   "errors": {
     "title": "Si è verificato un errore",

src/middleware.ts

@@ -6,6 +6,20 @@ import { routing } from "@/i18n/routing";
 
 const intlMiddleware = createIntlMiddleware(routing);
 
+// One-time marker: set after we've applied the user's profile language
+// once following sign-in, cleared whenever the login page is shown (so
+// the next sign-in re-applies it). Keeps the header switcher a
+// per-session override rather than forcing the profile locale on every
+// navigation.
+const LOCALE_INIT_COOKIE = "pieced_locale_init";
+
+const LOCALE_INIT_OPTS = {
+  path: "/",
+  httpOnly: true,
+  sameSite: "lax" as const,
+  maxAge: 8 * 60 * 60,
+};
+
 const publicPaths = ["/login", "/register", "/api/auth", "/api/register"];
 
 function isPublicPath(pathname: string): boolean {
@@ -26,6 +40,17 @@ export default async function middleware(request: NextRequest) {
     return NextResponse.next();
   }
 
+  const stripped = pathname.replace(/^\/(de|fr|it|en)(?=\/|$)/, "") || "/";
+
+  // Showing the login page resets the one-time locale marker so the
+  // next sign-in re-applies the user's profile language. Logout
+  // redirects here, which makes this the natural reset point.
+  if (stripped === "/login") {
+    const res = intlMiddleware(request);
+    res.cookies.delete(LOCALE_INIT_COOKIE);
+    return res;
+  }
+
   // Auth guard for protected paths
   if (!isPublicPath(pathname)) {
     const session = await auth();
@@ -34,6 +59,32 @@ export default async function middleware(request: NextRequest) {
       loginUrl.searchParams.set("callbackUrl", pathname);
       return NextResponse.redirect(loginUrl);
     }
+
+    // One-time apply of the user's preferred language after sign-in.
+    // Gated by LOCALE_INIT_COOKIE (cleared on the /login view), so it
+    // fires at most once per login; afterwards the URL and the header
+    // switcher control the locale freely.
+    const applied = request.cookies.get(LOCALE_INIT_COOKIE)?.value === "1";
+    const pref = (session as { platformUser?: { locale?: string } })
+      .platformUser?.locale;
+    const base = pref?.split("-")[0];
+    if (!applied && base && routing.locales.includes(base as never)) {
+      const target =
+        base === routing.defaultLocale
+          ? stripped
+          : `/${base}${stripped === "/" ? "" : stripped}`;
+      if (target !== pathname) {
+        const url = new URL(target, request.url);
+        url.search = request.nextUrl.search;
+        const res = NextResponse.redirect(url);
+        res.cookies.set(LOCALE_INIT_COOKIE, "1", LOCALE_INIT_OPTS);
+        return res;
+      }
+      // Already on the right locale — mark applied and continue.
+      const res = intlMiddleware(request);
+      res.cookies.set(LOCALE_INIT_COOKIE, "1", LOCALE_INIT_OPTS);
+      return res;
+    }
   }
 
   return intlMiddleware(request);

src/types/index.ts

@@ -3,6 +3,8 @@ export interface ZitadelClaims {
   "urn:zitadel:iam:user:resourceowner:id": string;
   "urn:zitadel:iam:user:resourceowner:name": string;
   "urn:zitadel:iam:org:project:roles"?: Record<string, Record<string, string>>;
+  /** Standard OIDC claim; ZITADEL maps the user's preferredLanguage. */
+  locale?: string;
 }
 
 /**
@@ -64,6 +66,14 @@ export interface SessionUser {
    *     user's display name instead (Bug 9 — the org name is opaque).
    */
   isPersonal: boolean;
+  /**
+   * The user's preferred UI language, sourced from the ZITADEL profile
+   * (`preferredLanguage`) via the OIDC `locale` claim at sign-in. Used
+   * once after login to land the user on their language; the header
+   * switcher is a per-session URL override that does not change this.
+   * Undefined for users whose ZITADEL profile predates the claim.
+   */
+  locale?: string;
 }
 
 // PiecedTenant CR (pieced.ch/v1alpha1)