refactor(i18n): Optimize internationalization configuration and add new translation items

- Add internationalization support to the LoadingState component
- Implement internationalization translations in the Profile page
- Use internationalized text in the TestEmailDialog component
- Update English and Chinese translation files by adding new translation entries

application/src/components/services/LoadingState.tsx

@@ -1,5 +1,7 @@
+import {useLanguage} from "@/contexts/LanguageContext.tsx";
 
 export function LoadingState() {
+	const { t } = useLanguage();
   return (
     <div className="flex items-center justify-center h-screen bg-background text-foreground">
       <div className="flex flex-col items-center text-center py-8 px-4 rounded-lg shadow-lg bg-card animate-fade-in">
@@ -7,8 +9,8 @@ export function LoadingState() {
           <div className="absolute w-12 h-12 rounded-full border-4 border-primary/20"></div>
           <div className="w-12 h-12 rounded-full border-4 border-t-primary border-r-transparent border-b-transparent border-l-transparent animate-spin"></div>
         </div>
-        <h3 className="text-xl font-medium mb-1">Loading server data</h3>
-        <p className="text-muted-foreground">Please wait while we retrieve your information...</p>
+        <h3 className="text-xl font-medium mb-1">{t("loadingServerData")}</h3>
+        <p className="text-muted-foreground">{t("retrievingYourInformation")}</p>
       </div>
     </div>
   );

application/src/components/settings/general/TestEmailDialog.tsx

@@ -194,9 +194,7 @@ const TestEmailDialog: React.FC<TestEmailDialogProps> = ({
           {/* Info message */}
           <Alert>
             <AlertCircle className="h-4 w-4" />
-            <AlertDescription>
-              This will send a test email using your configured SMTP settings. Make sure SMTP is properly configured first.
-            </AlertDescription>
+            <AlertDescription>{t("testEmailAlert", "settings")}</AlertDescription>
           </Alert>
         </div>
 
@@ -214,7 +212,7 @@ const TestEmailDialog: React.FC<TestEmailDialogProps> = ({
             ) : (
               <Mail className="h-4 w-4" />
             )}
-            {isLoading ? t("sending", "settings") : t("send", "common")}
+            {isLoading ? t("sending", "settings") : t("send", "settings")}
           </Button>
         </DialogFooter>
       </DialogContent>