[REFACTOR] 實作側邊欄與儀表板多語系化，修復 UI 位移與樣式優化

app/Http/Kernel.php

@@ -33,6 +33,7 @@ class Kernel extends HttpKernel
             \App\Http\Middleware\EncryptCookies::class,
             \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
             \Illuminate\Session\Middleware\StartSession::class,
+            \App\Http\Middleware\SetLocale::class,
             \Illuminate\View\Middleware\ShareErrorsFromSession::class,
             \App\Http\Middleware\VerifyCsrfToken::class,
             \Illuminate\Routing\Middleware\SubstituteBindings::class,