Add Forum page with layout, mock data, and routing; update navigation and localization

src/main.tsx

@@ -9,6 +9,7 @@ import App from './App.tsx'
 import Friends from './pages/Friends.tsx'
 import Blog from './pages/Blog.tsx'
 import Servers from './pages/Servers.tsx'
+import Forum from './pages/Forum.tsx'
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
@@ -20,6 +21,7 @@ createRoot(document.getElementById('root')!).render(
           <Route path="/friends" element={<Friends />} />
           <Route path="/blog" element={<Blog />} />
           <Route path="/servers" element={<Servers />} />
+          <Route path="/forum" element={<Forum />} />
         </Routes>
       </Router>
     </ThemeProvider>