Enhance Search Filter and Standardize `name_en` Fields

[karademirmustafa]

🚀 Objective:

• Ensure the search filter works case-insensitively and handles Turkish characters properly.
• Standardize the name_en fields in the database to have correct English names.

✅ Tasks:

• Update the name_en fields in the database with proper English names for countries and districts.
• Adjust the search filter to:
  • Ignore case sensitivity (e.g., turkiye, TURKIYE, Türkİye should all match "TÜRKİYE").
  • Handle Turkish characters (ğ,Ğ, ü,Ü, ş,Ş, ı,I,i,İ, ö,Ö, ç,Ç) properly in searches.
• Test search functionality to ensure accurate results regardless of capitalization or character variations.

🏆 Expected Outcome:

• API responses return name_en fields with correct English names.
• Searches work correctly regardless of case sensitivity or Turkish character variations.