feat: Add multilingual deployment progress messages

- Created backend i18n system with EN/NL/AR translations
- Frontend now sends language preference with deployment request
- Backend deployment messages follow user's selected language
- Translated key messages: initializing, creating app, SSL waiting, etc.
- Added top margin (100px) on mobile to prevent language button overlap

Fixes real-time deployment status showing English regardless of language selection.

client/src/pages/DeployPage.tsx

@@ -34,7 +34,7 @@ export default function DeployPage() {
       const response = await fetch('/api/deploy', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ name }),
+        body: JSON.stringify({ name, lang }),
       });
 
       const data = await response.json();