Phase 1: Infrastructure setup - Install next-intl and create basic i18n structure

- Install next-intl package - Create LanguageProvider hook with localStorage persistence - Create IntlProvider component for next-intl integration - Create Providers wrapper component - Update layout.tsx to include providers and set default lang to 'es' - Create initial translation files (common.json) for es, en, ca - Fix pre-existing TypeScript errors in various pages All tests passing, build successful.
2025-12-25 21:50:34 +01:00 · 2025-12-25 21:50:34 +01:00 · f7553df05d
commit f7553df05d
parent 1a47b3643f
15 changed files with 940 additions and 22 deletions
--- a/frontend/app/admin/price-history/page.tsx
+++ b/frontend/app/admin/price-history/page.tsx
@ -63,7 +63,7 @@ export default function AdminPriceHistoryPage() {
        <div style={styles.tableHeader}>
          <h2 style={styles.tableTitle}>Bitcoin Price History</h2>
          <div style={styles.headerActions}>
-            <span style={styles.totalCount}>{records.length} records</span>
+            <span style={styles.totalCount}>{records?.length ?? 0} records</span>
            <button onClick={fetchRecords} style={styles.refreshBtn} disabled={isLoadingData}>
              Refresh
            </button>
@ -98,7 +98,7 @@ export default function AdminPriceHistoryPage() {
                  </td>
                </tr>
              )}
-              {!error && !isLoadingData && records.length === 0 && (
+              {!error && !isLoadingData && (records?.length ?? 0) === 0 && (
                <tr>
                  <td colSpan={4} style={styles.emptyRow}>
                    No price records yet. Click &quot;Fetch Now&quot; to get the current price.
@ -107,7 +107,7 @@ export default function AdminPriceHistoryPage() {
              )}
              {!error &&
                !isLoadingData &&
-                records.map((record) => (
+                (records ?? []).map((record) => (
                  <tr key={record.id} style={styles.tr}>
                    <td style={styles.td}>{record.source}</td>
                    <td style={styles.td}>{record.pair}</td>
--- a/frontend/app/admin/trades/page.tsx
+++ b/frontend/app/admin/trades/page.tsx
@ -5,6 +5,7 @@ import { Permission } from "../../auth-context";
 import { adminApi } from "../../api";
 import { Header } from "../../components/Header";
 import { SatsDisplay } from "../../components/SatsDisplay";
+import { StatusBadge } from "../../components/StatusBadge";
 import { EmptyState } from "../../components/EmptyState";
 import { ConfirmationButton } from "../../components/ConfirmationButton";
 import { useRequireAuth } from "../../hooks/useRequireAuth";
@ -275,7 +276,9 @@ export default function AdminTradesPage() {
                        </span>
                      </div>

-                      <StatusBadge tradeStatus={trade.status} style={{ marginTop: "0.5rem" }} />
+                      <StatusBadge tradeStatus={trade.status} style={{ marginTop: "0.5rem" }}>
+                        {""}
+                      </StatusBadge>
                    </div>

                    {/* Actions */}
--- a/frontend/app/components/IntlProvider.tsx
+++ b/frontend/app/components/IntlProvider.tsx
@ -0,0 +1,34 @@
+"use client";
+
+import { NextIntlClientProvider } from "next-intl";
+import { ReactNode, useMemo } from "react";
+import { useLanguage } from "../hooks/useLanguage";
+
+// Import all locale messages
+import esCommon from "../../locales/es/common.json";
+import enCommon from "../../locales/en/common.json";
+import caCommon from "../../locales/ca/common.json";
+
+const messages = {
+  es: { common: esCommon },
+  en: { common: enCommon },
+  ca: { common: caCommon },
+};
+
+interface IntlProviderProps {
+  children: ReactNode;
+}
+
+export function IntlProvider({ children }: IntlProviderProps) {
+  const { locale } = useLanguage();
+
+  const localeMessages = useMemo(() => {
+    return messages[locale] || messages.es;
+  }, [locale]);
+
+  return (
+    <NextIntlClientProvider locale={locale} messages={localeMessages}>
+      {children}
+    </NextIntlClientProvider>
+  );
+}
--- a/frontend/app/components/Providers.tsx
+++ b/frontend/app/components/Providers.tsx
@ -0,0 +1,17 @@
+"use client";
+
+import { ReactNode } from "react";
+import { LanguageProvider } from "../hooks/useLanguage";
+import { IntlProvider } from "./IntlProvider";
+
+interface ProvidersProps {
+  children: ReactNode;
+}
+
+export function Providers({ children }: ProvidersProps) {
+  return (
+    <LanguageProvider>
+      <IntlProvider>{children}</IntlProvider>
+    </LanguageProvider>
+  );
+}
--- a/frontend/app/hooks/useLanguage.tsx
+++ b/frontend/app/hooks/useLanguage.tsx
@ -0,0 +1,54 @@
+"use client";
+
+import { useState, useEffect, createContext, useContext, ReactNode } from "react";
+
+export type Locale = "es" | "en" | "ca";
+
+const LOCALE_STORAGE_KEY = "arbret-locale";
+const DEFAULT_LOCALE: Locale = "es";
+
+interface LanguageContextType {
+  locale: Locale;
+  setLocale: (locale: Locale) => void;
+}
+
+const LanguageContext = createContext<LanguageContextType | undefined>(undefined);
+
+export function LanguageProvider({ children }: { children: ReactNode }) {
+  const [locale, setLocaleState] = useState<Locale>(DEFAULT_LOCALE);
+  const [isHydrated, setIsHydrated] = useState(false);
+
+  // Load locale from localStorage on mount
+  useEffect(() => {
+    const stored = localStorage.getItem(LOCALE_STORAGE_KEY);
+    if (stored && (stored === "es" || stored === "en" || stored === "ca")) {
+      setLocaleState(stored as Locale);
+    }
+    setIsHydrated(true);
+  }, []);
+
+  // Update HTML lang attribute when locale changes
+  useEffect(() => {
+    if (isHydrated) {
+      document.documentElement.lang = locale;
+    }
+  }, [locale, isHydrated]);
+
+  const setLocale = (newLocale: Locale) => {
+    setLocaleState(newLocale);
+    localStorage.setItem(LOCALE_STORAGE_KEY, newLocale);
+    document.documentElement.lang = newLocale;
+  };
+
+  return (
+    <LanguageContext.Provider value={{ locale, setLocale }}>{children}</LanguageContext.Provider>
+  );
+}
+
+export function useLanguage() {
+  const context = useContext(LanguageContext);
+  if (context === undefined) {
+    throw new Error("useLanguage must be used within a LanguageProvider");
+  }
+  return context;
+}
--- a/frontend/app/hooks/useTranslation.ts
+++ b/frontend/app/hooks/useTranslation.ts
@ -0,0 +1,8 @@
+"use client";
+
+import { useTranslations as useNextIntlTranslations } from "next-intl";
+
+export function useTranslation(namespace?: string) {
+  const t = useNextIntlTranslations(namespace);
+  return t;
+}
--- a/frontend/app/invites/page.tsx
+++ b/frontend/app/invites/page.tsx
@ -4,6 +4,7 @@ import { useState } from "react";
 import { invitesApi } from "../api";
 import { PageLayout } from "../components/PageLayout";
 import { StatusBadge } from "../components/StatusBadge";
+import { EmptyState } from "../components/EmptyState";
 import { useRequireAuth } from "../hooks/useRequireAuth";
 import { useAsyncData } from "../hooks/useAsyncData";
 import { components } from "../generated/api";
@ -49,9 +50,9 @@ export default function InvitesPage() {
  };

  const { READY, SPENT, REVOKED } = constants.inviteStatuses;
-  const readyInvites = invites.filter((i) => i.status === READY);
-  const spentInvites = invites.filter((i) => i.status === SPENT);
-  const revokedInvites = invites.filter((i) => i.status === REVOKED);
+  const readyInvites = (invites ?? []).filter((i) => i.status === READY);
+  const spentInvites = (invites ?? []).filter((i) => i.status === SPENT);
+  const revokedInvites = (invites ?? []).filter((i) => i.status === REVOKED);

  return (
    <PageLayout
@ -67,7 +68,7 @@ export default function InvitesPage() {
          </p>
        </div>

-        {invites.length === 0 ? (
+        {(invites?.length ?? 0) === 0 ? (
          <EmptyState
            message="You don't have any invites yet."
            hint="Contact an admin if you need invite codes to share."
--- a/frontend/app/layout.tsx
+++ b/frontend/app/layout.tsx
@ -1,8 +1,9 @@
 import { AuthProvider } from "./auth-context";
+import { Providers } from "./components/Providers";

 export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
-    <html lang="en">
+    <html lang="es">
      <head>
        <link rel="preconnect" href="https://fonts.googleapis.com" />
        <link rel="preconnect" href="https://fonts.gstatic.com" crossOrigin="anonymous" />
@ -37,7 +38,9 @@ export default function RootLayout({ children }: { children: React.ReactNode })
        `}</style>
      </head>
      <body>
-        <AuthProvider>{children}</AuthProvider>
+        <Providers>
+          <AuthProvider>{children}</AuthProvider>
+        </Providers>
      </body>
    </html>
  );
--- a/frontend/app/trades/[id]/page.tsx
+++ b/frontend/app/trades/[id]/page.tsx
@ -1,6 +1,6 @@
 "use client";

-import { CSSProperties } from "react";
+import { CSSProperties, useState } from "react";
 import { useParams, useRouter } from "next/navigation";
 import { Permission } from "../../auth-context";
 import { tradesApi } from "../../api";
@ -23,6 +23,7 @@ export default function TradeDetailPage() {
  const router = useRouter();
  const params = useParams();
  const publicId = params?.id as string | undefined;
+  const [cancelError, setCancelError] = useState<string | null>(null);

  const { user, isLoading, isAuthorized } = useRequireAuth({
    requiredPermission: Permission.VIEW_OWN_EXCHANGES,
@ -78,6 +79,10 @@ export default function TradeDetailPage() {
    );
  }

+  if (!trade) {
+    return null;
+  }
+
  const isBuy = trade.direction === "buy";

  return (
@ -97,7 +102,7 @@ export default function TradeDetailPage() {
            <div style={styles.detailGrid}>
              <div style={styles.detailRow}>
                <span style={styles.detailLabel}>Status:</span>
-                <StatusBadge tradeStatus={trade.status} />
+                <StatusBadge tradeStatus={trade.status}>{""}</StatusBadge>
              </div>
              <div style={styles.detailRow}>
                <span style={styles.detailLabel}>Time:</span>
@ -194,6 +199,7 @@ export default function TradeDetailPage() {
            </div>
          </div>

+          {cancelError && <div style={bannerStyles.errorBanner}>{cancelError}</div>}
          {trade.status === "booked" && (
            <div style={styles.actionSection}>
              <button
@ -209,7 +215,7 @@ export default function TradeDetailPage() {
                    await tradesApi.cancelTrade(trade.public_id);
                    router.push("/trades");
                  } catch (err) {
-                    setError(err instanceof Error ? err.message : "Failed to cancel trade");
+                    setCancelError(err instanceof Error ? err.message : "Failed to cancel trade");
                  }
                }}
                style={buttonStyles.secondaryButton}
--- a/frontend/app/trades/page.tsx
+++ b/frontend/app/trades/page.tsx
@ -8,6 +8,7 @@ import { PageLayout } from "../components/PageLayout";
 import { SatsDisplay } from "../components/SatsDisplay";
 import { StatusBadge } from "../components/StatusBadge";
 import { EmptyState } from "../components/EmptyState";
+import { ConfirmationButton } from "../components/ConfirmationButton";
 import { useRequireAuth } from "../hooks/useRequireAuth";
 import { useAsyncData } from "../hooks/useAsyncData";
 import { useMutation } from "../hooks/useMutation";
@ -54,10 +55,10 @@ export default function TradesPage() {
    }
  };

-  const upcomingTrades = trades.filter(
+  const upcomingTrades = (trades ?? []).filter(
    (t) => t.status === "booked" && new Date(t.slot_start) > new Date()
  );
-  const pastOrFinalTrades = trades.filter(
+  const pastOrFinalTrades = (trades ?? []).filter(
    (t) => t.status !== "booked" || new Date(t.slot_start) <= new Date()
  );

@ -74,7 +75,7 @@ export default function TradesPage() {

      {isLoadingTrades ? (
        <EmptyState message="Loading trades..." isLoading={true} />
-      ) : trades.length === 0 ? (
+      ) : (trades?.length ?? 0) === 0 ? (
        <EmptyState
          message="You don't have any trades yet."
          action={
@ -140,7 +141,9 @@ export default function TradesPage() {
                              /BTC
                            </span>
                          </div>
-                          <StatusBadge tradeStatus={trade.status} style={{ marginTop: "0.5rem" }} />
+                          <StatusBadge tradeStatus={trade.status} style={{ marginTop: "0.5rem" }}>
+                            {""}
+                          </StatusBadge>
                        </div>

                        <div style={tradeCardStyles.buttonGroup}>
@ -224,7 +227,7 @@ export default function TradesPage() {
                        </span>
                      </div>
                      <div style={tradeCardStyles.buttonGroup}>
-                        <StatusBadge tradeStatus={trade.status} />
+                        <StatusBadge tradeStatus={trade.status}>{""}</StatusBadge>
                        <button
                          onClick={(e) => {
                            e.stopPropagation();
--- a/frontend/locales/ca/common.json
+++ b/frontend/locales/ca/common.json
@ -0,0 +1,15 @@
+{
+  "loading": "Carregant...",
+  "error": "Error",
+  "save": "Desar",
+  "cancel": "Cancel·lar",
+  "back": "Enrere",
+  "continue": "Continuar",
+  "confirm": "Confirmar",
+  "delete": "Eliminar",
+  "edit": "Editar",
+  "close": "Tancar",
+  "yes": "Sí",
+  "no": "No",
+  "retry": "Tornar a intentar"
+}
--- a/frontend/locales/en/common.json
+++ b/frontend/locales/en/common.json
@ -0,0 +1,15 @@
+{
+  "loading": "Loading...",
+  "error": "Error",
+  "save": "Save",
+  "cancel": "Cancel",
+  "back": "Back",
+  "continue": "Continue",
+  "confirm": "Confirm",
+  "delete": "Delete",
+  "edit": "Edit",
+  "close": "Close",
+  "yes": "Yes",
+  "no": "No",
+  "retry": "Retry"
+}
--- a/frontend/locales/es/common.json
+++ b/frontend/locales/es/common.json
@ -0,0 +1,15 @@
+{
+  "loading": "Cargando...",
+  "error": "Error",
+  "save": "Guardar",
+  "cancel": "Cancelar",
+  "back": "Atrás",
+  "continue": "Continuar",
+  "confirm": "Confirmar",
+  "delete": "Eliminar",
+  "edit": "Editar",
+  "close": "Cerrar",
+  "yes": "Sí",
+  "no": "No",
+  "retry": "Reintentar"
+}
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@ -10,6 +10,7 @@
      "dependencies": {
        "bech32": "^2.0.0",
        "next": "15.1.2",
+        "next-intl": "^4.6.1",
        "react": "19.0.0",
        "react-dom": "19.0.0"
      },
@ -1093,6 +1094,66 @@
        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
      }
    },
+    "node_modules/@formatjs/ecma402-abstract": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/@formatjs/ecma402-abstract/-/ecma402-abstract-2.3.6.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "2.2.7",
+        "@formatjs/intl-localematcher": "0.6.2",
+        "decimal.js": "^10.4.3",
+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/@formatjs/ecma402-abstract/node_modules/@formatjs/intl-localematcher": {
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+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.6.2.tgz",
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+      "dependencies": {
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+    "node_modules/@formatjs/fast-memoize": {
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+      "dependencies": {
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+    "node_modules/@formatjs/icu-messageformat-parser": {
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+      "dependencies": {
+        "@formatjs/ecma402-abstract": "2.3.6",
+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/@formatjs/intl-localematcher": {
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+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.5.10.tgz",
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+      "dependencies": {
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+      }
+    },
    "node_modules/@humanfs/core": {
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      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
@ -1718,6 +1779,313 @@
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      }
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+        "@parcel/watcher-darwin-arm64": "2.5.1",
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@ -2121,6 +2655,15 @@
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@ -2822,6 +3365,18 @@
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@ -4218,6 +4803,31 @@
        "url": "https://github.com/sponsors/sindresorhus"
      }
    },
+    "node_modules/micromatch": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.8.tgz",
+      "integrity": "sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==",
+      "license": "MIT",
+      "dependencies": {
+        "braces": "^3.0.3",
+        "picomatch": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=8.6"
+      }
+    },
+    "node_modules/micromatch/node_modules/picomatch": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
+      "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=8.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
    "node_modules/minimatch": {
      "version": "5.1.6",
      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-5.1.6.tgz",
@ -4273,6 +4883,15 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/negotiator": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-1.0.0.tgz",
+      "integrity": "sha512-8Ofs/AUQh8MaEcrlq5xOX0CQ9ypTF5dl78mjlMNfOK08fzpgTHQRQPBxcPlEtIw0yRpws+Zo/3r+5WRby7u3Gg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
    "node_modules/next": {
      "version": "15.1.2",
      "resolved": "https://registry.npmjs.org/next/-/next-15.1.2.tgz",
@ -4328,6 +4947,98 @@
        }
      }
    },
+    "node_modules/next-intl": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/next-intl/-/next-intl-4.6.1.tgz",
+      "integrity": "sha512-KlWgWtKLBPUsTPgxqwyjws1wCMD2QKxLlVjeeGj53DC1JWfKmBShKOrhIP0NznZrRQ0GleeoDUeHSETmyyIFeA==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/amannn"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/intl-localematcher": "^0.5.4",
+        "@parcel/watcher": "^2.4.1",
+        "@swc/core": "^1.15.2",
+        "negotiator": "^1.0.0",
+        "next-intl-swc-plugin-extractor": "^4.6.1",
+        "po-parser": "^2.0.0",
+        "use-intl": "^4.6.1"
+      },
+      "peerDependencies": {
+        "next": "^12.0.0 || ^13.0.0 || ^14.0.0 || ^15.0.0 || ^16.0.0",
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || >=19.0.0-rc <19.0.0 || ^19.0.0",
+        "typescript": "^5.0.0"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/next-intl-swc-plugin-extractor": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/next-intl-swc-plugin-extractor/-/next-intl-swc-plugin-extractor-4.6.1.tgz",
+      "integrity": "sha512-+HHNeVERfSvuPDF7LYVn3pxst5Rf7EYdUTw7C7WIrYhcLaKiZ1b9oSRkTQddAN3mifDMCfHqO4kAQ/pcKiBl3A==",
+      "license": "MIT"
+    },
+    "node_modules/next-intl/node_modules/@swc/core": {
+      "version": "1.15.7",
+      "resolved": "https://registry.npmjs.org/@swc/core/-/core-1.15.7.tgz",
+      "integrity": "sha512-kTGB8XI7P+pTKW83tnUEDVP4zduF951u3UAOn5eTi0vyW6MvL56A3+ggMdfuVFtDI0/DsbSzf5z34HVBbuScWw==",
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@swc/counter": "^0.1.3",
+        "@swc/types": "^0.1.25"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/swc"
+      },
+      "optionalDependencies": {
+        "@swc/core-darwin-arm64": "1.15.7",
+        "@swc/core-darwin-x64": "1.15.7",
+        "@swc/core-linux-arm-gnueabihf": "1.15.7",
+        "@swc/core-linux-arm64-gnu": "1.15.7",
+        "@swc/core-linux-arm64-musl": "1.15.7",
+        "@swc/core-linux-x64-gnu": "1.15.7",
+        "@swc/core-linux-x64-musl": "1.15.7",
+        "@swc/core-win32-arm64-msvc": "1.15.7",
+        "@swc/core-win32-ia32-msvc": "1.15.7",
+        "@swc/core-win32-x64-msvc": "1.15.7"
+      },
+      "peerDependencies": {
+        "@swc/helpers": ">=0.5.17"
+      },
+      "peerDependenciesMeta": {
+        "@swc/helpers": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/next-intl/node_modules/@swc/helpers": {
+      "version": "0.5.18",
+      "resolved": "https://registry.npmjs.org/@swc/helpers/-/helpers-0.5.18.tgz",
+      "integrity": "sha512-TXTnIcNJQEKwThMMqBXsZ4VGAza6bvN4pa41Rkqoio6QBKMvo+5lexeTMScGCIxtzgQJzElcvIltani+adC5PQ==",
+      "license": "Apache-2.0",
+      "optional": true,
+      "peer": true,
+      "dependencies": {
+        "tslib": "^2.8.0"
+      }
+    },
+    "node_modules/node-addon-api": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-7.1.1.tgz",
+      "integrity": "sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==",
+      "license": "MIT"
+    },
    "node_modules/node-releases": {
      "version": "2.0.27",
      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.27.tgz",
@ -4586,6 +5297,12 @@
        "node": ">=4"
      }
    },
+    "node_modules/po-parser": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/po-parser/-/po-parser-2.0.0.tgz",
+      "integrity": "sha512-SZvoKi3PoI/hHa2V9je9CW7Xgxl4dvO74cvaa6tWShIHT51FkPxje6pt0gTJznJrU67ix91nDaQp2hUxkOYhKA==",
+      "license": "MIT"
+    },
    "node_modules/postcss": {
      "version": "8.4.31",
      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
@ -5202,6 +5919,18 @@
      "dev": true,
      "license": "MIT"
    },
+    "node_modules/to-regex-range": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+      "license": "MIT",
+      "dependencies": {
+        "is-number": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=8.0"
+      }
+    },
    "node_modules/tough-cookie": {
      "version": "5.1.2",
      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.1.2.tgz",
@ -5277,7 +6006,7 @@
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      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "dev": true,
+      "devOptional": true,
      "license": "Apache-2.0",
      "bin": {
        "tsc": "bin/tsc",
@ -5359,6 +6088,20 @@
        "punycode": "^2.1.0"
      }
    },
+    "node_modules/use-intl": {
+      "version": "4.6.1",
+      "resolved": "https://registry.npmjs.org/use-intl/-/use-intl-4.6.1.tgz",
+      "integrity": "sha512-mUIj6QvJZ7Rk33mLDxRziz1YiBBAnIji8YW4TXXMdYHtaPEbVucrXD3iKQGAqJhbVn0VnjrEtIKYO1B18mfSJw==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "^2.2.0",
+        "@schummar/icu-type-parser": "1.21.5",
+        "intl-messageformat": "^10.5.14"
+      },
+      "peerDependencies": {
+        "react": "^17.0.0 || ^18.0.0 || >=19.0.0-rc <19.0.0 || ^19.0.0"
+      }
+    },
    "node_modules/vite": {
      "version": "5.4.21",
      "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
--- a/frontend/package.json
+++ b/frontend/package.json
@ -19,6 +19,7 @@
  "dependencies": {
    "bech32": "^2.0.0",
    "next": "15.1.2",
+    "next-intl": "^4.6.1",
    "react": "19.0.0",
    "react-dom": "19.0.0"
  },