fix: rename Office Translator to Wordly everywhere

Replaced all references to "Office Translator" with "Wordly" across
i18n translations (13 locales), auth forms, layout components, admin
sidebar, and page metadata.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/app/auth/register/RegisterForm.tsx

@@ -170,7 +170,7 @@ export function RegisterForm() {
             <Languages className="h-6 w-6" />
           </div>
           <span className="text-2xl font-semibold text-foreground group-hover:text-primary transition-colors duration-300">
-            Office Translator
+            Wordly
           </span>
         </Link>