feat: add Italian language support

Added complete Italian (it) translation for the Biblical Guide application:
- Created messages/it.json with full Italian translations
- Updated i18n.ts to include Italian locale
- Updated middleware.ts to handle Italian routes
- Added Italian to language options in all locale files (en, ro, es)

Users can now access the app in Italian at /it/* routes and select Italian from the language settings.

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

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

messages/ro.json

@@ -283,7 +283,8 @@
         "options": {
           "en": "Engleză",
           "ro": "Română",
-          "es": "Spaniolă"
+          "es": "Spaniolă",
+          "it": "Italiană"
         }
       },
       "alerts": {
@@ -481,7 +482,8 @@
     "languages": {
       "ro": "Română",
       "en": "English",
-      "es": "Español"
+      "es": "Español",
+      "it": "Italiano"
     }
   },
   "bookmarks": {