Feature: 添加i18n支持

app/pages/[...all].vue

@@ -3,10 +3,10 @@
     <div text4xl>
         <div i-ep-warning inline-block />
     </div>
-    <div>Not found</div>
+    <div>{{ $t('not-found') }}</div>
     <div>
         <button text-sm btn m="3 t8" @click="router.back()">
-            Back
+            {{ $t('back') }}
         </button>
     </div>
 </main>