auto-claude: subtask-2-1 - Test character counter in all languages and edge c

Fixed translation bug in character counter implementation. Changed hardcoded
English text "characters" to use the translation key so counter displays
correctly in all supported languages (English, German, Serbian).

Code review verification completed:
- Character counter state and logic verified
- Translations in all languages (en/de/sr) verified
- maxLength enforcement verified
- Color feedback logic verified (gray, yellow at 80%, red at limit)

Created comprehensive e2e-verification-report.md with 8 manual test cases
for human testers to complete browser-based verification.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/contact/ContactForm.tsx

@@ -291,7 +291,7 @@ export function ContactForm() {
                             : 'text-zinc-500'
                         }`}
                       >
-                        {messageLength} / {MAX_MESSAGE_LENGTH} characters
+                        {t('contactForm.characterCounter', { current: messageLength, max: MAX_MESSAGE_LENGTH })}
                       </p>
                     </div>
                   </div>