Add i18n, routing and dark-mode support

Introduce internationalization and basic routing: add i18n initialization (src/i18n.js), translation files (public/i18n/en.json, de.json), and wire i18n into the app (import in main.jsx). Update App.jsx to use react-router (BrowserRouter, Routes) and react-i18next (useTranslation), provide simple Landing/Login/Imprint pages, a language toggle and a dark-mode toggle. Add dependencies in package.json (i18next, i18next-http-backend, react-i18next, react-router-dom) and small Tailwind style tweak (custom-variant for dark) in src/style.css.

package-lock.json

@@ -10,8 +10,12 @@
       "dependencies": {
         "@mdi/font": "~7.4.47",
         "@tailwindcss/vite": "~4.2.2",
+        "i18next": "~26.0.0",
+        "i18next-http-backend": "~3.0.2",
         "react": "^19.2.4",
-        "react-dom": "^19.2.4"
+        "react-dom": "^19.2.4",
+        "react-i18next": "~17.0.0",
+        "react-router-dom": "~7.13.2"
       },
       "devDependencies": {
         "@vitejs/plugin-react": "^6.0.1",
@@ -21,6 +25,15 @@
         "vite": "^8.0.1"
       }
     },
+    "node_modules/@babel/runtime": {
+      "version": "7.29.2",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.2.tgz",
+      "integrity": "sha512-JiDShH45zKHWyGe4ZNVRrCjBz8Nh9TMmZG1kh4QTK8hCBTWBi8Da+i7s1fJw7/lYpM4ccepSNfqzZ/QvABBi5g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.9.1.tgz",
@@ -773,6 +786,28 @@
       ],
       "license": "CC-BY-4.0"
     },
+    "node_modules/cookie": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-1.1.1.tgz",
+      "integrity": "sha512-ei8Aos7ja0weRpFzJnEA9UHJ/7XQmqglbRwnf2ATjcB9Wq874VKH9kfjjirM6UhU2/E5fFYadylyhFldcqSidQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
+    "node_modules/cross-fetch": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-4.0.0.tgz",
+      "integrity": "sha512-e4a5N8lVvuLgAWgnCrLr2PP0YyDOTHa9H/Rj54dirp61qXnNq46m82bRhNqIA5VccJtWBvPTFRV3TtvHUKPB1g==",
+      "license": "MIT",
+      "dependencies": {
+        "node-fetch": "^2.6.12"
+      }
+    },
     "node_modules/detect-libc": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",
@@ -863,6 +898,55 @@
       "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
       "license": "ISC"
     },
+    "node_modules/html-parse-stringify": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/html-parse-stringify/-/html-parse-stringify-3.0.1.tgz",
+      "integrity": "sha512-KknJ50kTInJ7qIScF3jeaFRpMpE8/lfiTdzf/twXyPBLAGrLRTmkz3AdTnKeh40X8k9L2fdYwEp/42WGXIRGcg==",
+      "license": "MIT",
+      "dependencies": {
+        "void-elements": "3.1.0"
+      }
+    },
+    "node_modules/i18next": {
+      "version": "26.0.0",
+      "resolved": "https://registry.npmjs.org/i18next/-/i18next-26.0.0.tgz",
+      "integrity": "sha512-+Dg27j7VH40WRy+Q010hj3jxlxDb3qFkA7EwuK4kx0+glLxEqZsxdB8MqliPBkTrXEuNlEfeosM3lucAHK+0tQ==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://www.locize.com/i18next"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.i18next.com/how-to/faq#i18next-is-awesome.-how-can-i-support-the-project"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.locize.com"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.29.2"
+      },
+      "peerDependencies": {
+        "typescript": "^5 || ^6"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/i18next-http-backend": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/i18next-http-backend/-/i18next-http-backend-3.0.2.tgz",
+      "integrity": "sha512-PdlvPnvIp4E1sYi46Ik4tBYh/v/NbYfFFgTjkwFl0is8A18s7/bx9aXqsrOax9WUbeNS6mD2oix7Z0yGGf6m5g==",
+      "license": "MIT",
+      "dependencies": {
+        "cross-fetch": "4.0.0"
+      }
+    },
     "node_modules/jiti": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.6.1.tgz",
@@ -1148,6 +1232,26 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/node-fetch": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.7.0.tgz",
+      "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
+      "license": "MIT",
+      "dependencies": {
+        "whatwg-url": "^5.0.0"
+      },
+      "engines": {
+        "node": "4.x || >=6.0.0"
+      },
+      "peerDependencies": {
+        "encoding": "^0.1.0"
+      },
+      "peerDependenciesMeta": {
+        "encoding": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/node-releases": {
       "version": "2.0.36",
       "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.36.tgz",
@@ -1162,9 +1266,9 @@
       "license": "ISC"
     },
     "node_modules/picomatch": {
-      "version": "4.0.3",
+      "version": "4.0.4",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
-      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
       "license": "MIT",
       "engines": {
         "node": ">=12"
@@ -1229,6 +1333,71 @@
         "react": "^19.2.4"
       }
     },
+    "node_modules/react-i18next": {
+      "version": "17.0.0",
+      "resolved": "https://registry.npmjs.org/react-i18next/-/react-i18next-17.0.0.tgz",
+      "integrity": "sha512-L7aqwOePCExt6nlF7000lN2YKWnR7IpSpQId9sj01798Xn3LAncBdTHKl9lA/nr+YrG78BTqWPJxq9mlrrmH7Q==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.29.2",
+        "html-parse-stringify": "^3.0.1",
+        "use-sync-external-store": "^1.6.0"
+      },
+      "peerDependencies": {
+        "i18next": ">= 25.10.10",
+        "react": ">= 16.8.0",
+        "typescript": "^5 || ^6"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        },
+        "react-native": {
+          "optional": true
+        },
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/react-router": {
+      "version": "7.13.2",
+      "resolved": "https://registry.npmjs.org/react-router/-/react-router-7.13.2.tgz",
+      "integrity": "sha512-tX1Aee+ArlKQP+NIUd7SE6Li+CiGKwQtbS+FfRxPX6Pe4vHOo6nr9d++u5cwg+Z8K/x8tP+7qLmujDtfrAoUJA==",
+      "license": "MIT",
+      "dependencies": {
+        "cookie": "^1.0.1",
+        "set-cookie-parser": "^2.6.0"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=18",
+        "react-dom": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/react-router-dom": {
+      "version": "7.13.2",
+      "resolved": "https://registry.npmjs.org/react-router-dom/-/react-router-dom-7.13.2.tgz",
+      "integrity": "sha512-aR7SUORwTqAW0JDeiWF07e9SBE9qGpByR9I8kJT5h/FrBKxPMS6TiC7rmVO+gC0q52Bx7JnjWe8Z1sR9faN4YA==",
+      "license": "MIT",
+      "dependencies": {
+        "react-router": "7.13.2"
+      },
+      "engines": {
+        "node": ">=20.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=18",
+        "react-dom": ">=18"
+      }
+    },
     "node_modules/rolldown": {
       "version": "1.0.0-rc.10",
       "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.0.0-rc.10.tgz",
@@ -1274,6 +1443,12 @@
       "integrity": "sha512-eNv+WrVbKu1f3vbYJT/xtiF5syA5HPIMtf9IgY/nKg0sWqzAUEvqY/xm7OcZc/qafLx/iO9FgOmeSAp4v5ti/Q==",
       "license": "MIT"
     },
+    "node_modules/set-cookie-parser": {
+      "version": "2.7.2",
+      "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.7.2.tgz",
+      "integrity": "sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==",
+      "license": "MIT"
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -1318,6 +1493,12 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
+      "license": "MIT"
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -1356,6 +1537,15 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/use-sync-external-store": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
+      "integrity": "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/vite": {
       "version": "8.0.1",
       "resolved": "https://registry.npmjs.org/vite/-/vite-8.0.1.tgz",
@@ -1432,6 +1622,31 @@
           "optional": true
         }
       }
+    },
+    "node_modules/void-elements": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/void-elements/-/void-elements-3.1.0.tgz",
+      "integrity": "sha512-Dhxzh5HZuiHQhbvTW9AMetFfBHDMYpo23Uo9btPXgdYP+3T5S+p+jgNy7spra+veYhBP2dCSgxR/i2Y02h5/6w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
     }
   }
 }

package.json

@@ -11,8 +11,12 @@
   "dependencies": {
     "@mdi/font": "~7.4.47",
     "@tailwindcss/vite": "~4.2.2",
+    "i18next": "~26.0.0",
+    "i18next-http-backend": "~3.0.2",
     "react": "^19.2.4",
-    "react-dom": "^19.2.4"
+    "react-dom": "^19.2.4",
+    "react-i18next": "~17.0.0",
+    "react-router-dom": "~7.13.2"
   },
   "devDependencies": {
     "@vitejs/plugin-react": "^6.0.1",

public/i18n/de.json

@@ -0,0 +1,5 @@
+{
+  "welcome": "Dein Game-Backlog unter Kontrolle",
+  "login": "Anmelden",
+  "imprint": "Impressum"
+}

public/i18n/en.json

@@ -0,0 +1,5 @@
+{
+  "welcome": "Control your game backlog",
+  "login": "Login",
+  "imprint": "Imprint"
+}

src/App.jsx

@@ -1,67 +1,95 @@
-import React from 'react';
+import { BrowserRouter, Routes, Route, Link } from 'react-router-dom';
-
+import { useTranslation } from 'react-i18next';
-function App() {
+import { useState, useEffect } from 'react';
-  // Array to generate the placeholder game cards
-  const mockGames = [1, 2, 3];
 
+// Placeholder components to keep the routing structure simple
+function LandingPage() {
+    const { t } = useTranslation();
     return (
-      <div className="min-h-screen bg-slate-50 flex flex-col">
+        <div className="grow flex items-center justify-center p-4">
-        <header className="border-b shadow-sm bg-white p-4 flex justify-between items-center">
+            <h1 className="text-3xl md:text-5xl font-bold text-slate-900 dark:text-white">
-          <div className="font-bold text-blue-600 flex items-center">
+                {t('welcome')}
-            <i className="mdi mdi-controller mr-2 text-xl"></i>
-            To Be Played
-          </div>
-          <div>
-            <button className="mr-4">Dashboard</button>
-            <button className="bg-blue-600 text-white px-4 py-2 rounded">Login</button>
-          </div>
-        </header>
-
-        <main className="grow container mx-auto py-20 px-4">
-          <section className="text-center mb-16">
-            <h1 className="text-4xl md:text-5xl font-extrabold text-slate-900 mb-4">
-              Dein Game-Backlog unter Kontrolle.
             </h1>
-            <p className="text-lg text-slate-600 max-w-2xl mx-auto">
-              Willkommen bei deiner neuen Applikation. Hier werden bald deine Spiele aus dem
-              <code className="bg-slate-200 px-1 rounded text-blue-600 ml-1">game-service</code> gelistet.
-            </p>
-          </section>
-
-          <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
-            {mockGames.map((n) => {
-              return (
-                  <div key={n} className="border border-slate-200 rounded-xl bg-white overflow-hidden">
-                    <div className="h-48 bg-slate-100">
-                      <img
-                          src={`https://picsum.photos/500/300?random=${n}`}
-                          alt={`Beispiel Spiel ${n}`}
-                          className="w-full h-full object-cover"
-                      />
-                    </div>
-                    <div className="p-4">
-                      <h3 className="font-bold text-lg">Beispiel Spiel {n}</h3>
-                      <p className="text-sm text-slate-500 mb-2">Status: In Warteschlange</p>
-                      <p className="text-slate-500 text-sm">
-                        Dies ist ein Platzhalter für ein Spiel in deiner Liste. Später kommen hier echte Daten per API.
-                      </p>
-                    </div>
-                    <div className="border-t p-4">
-                      <button className="w-full bg-blue-100 text-blue-700 py-2 rounded font-medium hover:bg-blue-200">
-                        Details ansehen
-                      </button>
-                    </div>
-                  </div>
-              );
-            })}
-          </div>
-        </main>
-
-        <footer className="bg-white border-t py-4 text-center text-slate-400 text-sm">
-          &copy; 2026 To Be Played — Entwickelt mit React & Tailwind v4
-        </footer>
         </div>
     );
 }
 
+function LoginPage() {
+    const { t } = useTranslation();
+    return (
+        <div className="grow flex items-center justify-center p-4">
+            <h2 className="text-2xl text-slate-800 dark:text-slate-200">{t('login')}</h2>
+        </div>
+    );
+}
+
+function ImprintPage() {
+    const { t } = useTranslation();
+    return (
+        <div className="grow p-8">
+            <h2 className="text-2xl text-slate-800 dark:text-slate-200">{t('imprint')}</h2>
+        </div>
+    );
+}
+
+function App() {
+    const { t, i18n } = useTranslation();
+    const [isDarkMode, setIsDarkMode] = useState(true);
+
+    // Apply dark mode class to the root HTML element for Tailwind
+    useEffect(() => {
+        if (isDarkMode) {
+            document.documentElement.classList.add('dark');
+        } else {
+            document.documentElement.classList.remove('dark');
+        }
+    }, [isDarkMode]);
+
+    const toggleLanguage = () => {
+        if (i18n.language === 'de') {
+            i18n.changeLanguage('en').then(r => console.log("Changed language to en"));
+        } else {
+            i18n.changeLanguage('de').then(r => console.log("Changed language to en"));
+        }
+    };
+
+    return (
+        <BrowserRouter>
+            <div className="min-h-screen flex flex-col bg-slate-50 dark:bg-slate-950 transition-colors duration-300">
+                <header className="p-4 flex justify-between items-center border-b border-slate-200 dark:border-slate-800 bg-white dark:bg-slate-900">
+                    <Link to="/" className="font-bold text-blue-600 dark:text-blue-400 text-xl flex items-center">
+                        <i className="mdi mdi-controller mr-2"></i> To Be Played
+                    </Link>
+
+                    <div className="flex gap-4 items-center">
+                        <button onClick={toggleLanguage} className="text-sm font-medium dark:text-slate-300">
+                            {i18n.language.toUpperCase()}
+                        </button>
+                        <button onClick={() => { setIsDarkMode(!isDarkMode); }} className="text-xl dark:text-slate-300">
+                            <i className={isDarkMode ? "mdi mdi-weather-sunny" : "mdi mdi-weather-night"}></i>
+                        </button>
+                        <Link to="/login" className="bg-blue-600 hover:bg-blue-700 text-white px-4 py-2 rounded-lg font-medium transition-colors">
+                            {t('login')}
+                        </Link>
+                    </div>
+                </header>
+
+                <main className="flex-grow flex flex-col">
+                    <Routes>
+                        <Route path="/" element={<LandingPage />} />
+                        <Route path="/login" element={<LoginPage />} />
+                        <Route path="/impressum" element={<ImprintPage />} />
+                    </Routes>
+                </main>
+
+                <footer className="p-4 text-center border-t border-slate-200 dark:border-slate-800 text-slate-500 text-sm bg-white dark:bg-slate-900">
+                    <Link to="/impressum" className="hover:text-blue-500 transition-colors">
+                        {t('imprint')}
+                    </Link>
+                </footer>
+            </div>
+        </BrowserRouter>
+    );
+}
+
 export default App;

src/i18n.js

@@ -0,0 +1,19 @@
+import i18n from 'i18next';
+import {initReactI18next} from 'react-i18next';
+import HttpBackend from 'i18next-http-backend';
+
+
+i18n.use(HttpBackend)
+    .use(initReactI18next)
+    .init({
+        lng: 'de',
+        fallbackLng: 'en',
+        backend: {
+            loadPath: '/i18n/{{lng}}.json',
+        },
+        interpolation: {
+            escapeValue: false
+        }
+    });
+
+export default i18n;

src/main.jsx

@@ -1,6 +1,7 @@
 import { StrictMode } from 'react';
 import { createRoot } from 'react-dom/client';
 import App from './App.jsx';
+import './i18n';
 import './style.css';
 import '@mdi/font/css/materialdesignicons.css';
 

src/style.css

@@ -1 +1,3 @@
 @import "tailwindcss";
+
+@custom-variant dark (&:is(.dark *));