refactor: improve landing page copy and terminology

- Reorder card-2 text to lead with the value proposition (Gmail sign-in)
- Update Croatian translations to consistently use "aplikacija" instead of "alat"
- Improve sentence flow for better readability in both languages

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

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

messages/en.json

@@ -37,7 +37,7 @@
     },
     "card-2": {
       "title": "What do I need to get started?",
-      "text": "<p>You don't need to fill out registration forms or confirm your email address.</p><p>All you need is a <strong>Gmail account to sign in</strong> and you can start using the tool right away - <strong>turnkey solution!</strong></p>"
+      "text": "<p>All you need is a <strong>Gmail account to sign in</strong> and you can start using the tool right away!</p><p>You don't need to fill out registration forms or confirm your email address - it's a <strong>turnkey solution!</strong></p>"
     },
     "sign-in-button": "Sign in with",
     "disclaimer": "<disclaimer><bold>Note:</bold> by signing in to this web application, you accept the <linkTermsOfService>Terms of Service</linkTermsOfService> and <linkPrivacyPolicy>Privacy Policy</linkPrivacyPolicy>.</disclaimer>"