fix: remove undefined showTranslationFallbackNotice function call

- Removed call to showTranslationFallbackNotice(language) which was undefined
- Console warning already logs the fallback behavior
- Prevents ReferenceError when loading translated documents
- Related to glossary translation fallback handling

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

public/js/docs-app.js

@@ -655,8 +655,8 @@ async function loadDocument(slug, lang = null) {
         const enData = await enResponse.json();
 
         if (enData.success) {
-          // Show notification that translation isn't available
+          // Translation not available - falling back to English
-          showTranslationFallbackNotice(language);
+          // (console warning already logged above)
           const fallbackData = enData;
           fallbackData.document.language = 'en';
           fallbackData.document.fallback = true;