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/components/layout/site-footer.tsx

@@ -4,7 +4,7 @@ export function SiteFooter() {
   return (
     <footer className="border-t border-border py-6 text-center text-xs text-muted-foreground">
       <div className="mx-auto max-w-5xl px-6 flex flex-col sm:flex-row items-center justify-between gap-4">
-        <span>© 2026 Office Translator. All rights reserved.</span>
+        <span>© 2026 Wordly. All rights reserved.</span>
         <div className="flex items-center gap-6">
           <Link href="/pricing" className="hover:text-foreground transition-colors">
             Pricing

frontend/src/components/layout/site-header.tsx

@@ -11,7 +11,7 @@ export function SiteHeader() {
             <Languages className="size-4 text-primary-foreground" />
           </div>
           <span className="text-base font-semibold tracking-tight text-foreground">
-            Office Translator
+            Wordly
           </span>
         </Link>