feat: add Spanish language support

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

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

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

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

messages/ro.json

@@ -282,7 +282,8 @@
         "helper": "Alege limbile pentru care vrei să vezi rugăciuni. Limba curentă rămâne selectată.",
         "options": {
           "en": "Engleză",
-          "ro": "Română"
+          "ro": "Română",
+          "es": "Spaniolă"
         }
       },
       "alerts": {
@@ -479,7 +480,8 @@
     },
     "languages": {
       "ro": "Română",
-      "en": "English"
+      "en": "English",
+      "es": "Español"
     }
   },
   "bookmarks": {