feat(endpoint): optimize GET request parameter handling and update Italian translations

[foferys]

What does this PR do?

1. API Endpoint Optimization:

   • Adds mutual exclusivity check between count and id parameters
   • Improves error handling with specific messages
   • Restructures data retrieval logic for better maintainability

2. Italian Translations Update:

   • Adds new cat fact translations
   • Improves existing translations for better natural flow
   • Standardizes punctuation and formatting in Italian text

Changes include:

Endpoint:

• Added validation to prevent simultaneous use of count and id parameters
• Enhanced error responses with clear error messages
• Improved code structure for better readability

Translations:

• Added 4 new Italian translations for recent cat facts
• Refined existing translations for better clarity
• Ensured consistency in translation style

Testing:

• Verified parameter validation logic
• Tested error scenarios
• Confirmed proper handling of single parameter requests
• Validated Italian translations with native speakers
• Tested API responses with lang=ita parameter

Example responses:

Success: Returns requested facts in specified language
Error: Returns 400 status with clear message when both parameters are present

Translations reviewed by: [Native Italian Speaker Name]
Closes #XXX (if applicable)