Updated DeepL API requests to include the `Authorization` header with the auth key instead of passing it as a form parameter. This aligns with updated API requirements and ensures compatibility.
+ I18N
Fixes: 1) Correct alignment and ensure continuity in French and Polish translation files; 2) Address incomplete business identifier message in Spanish.
Extra: Improve clarity in token refresh and viewset-related comments; trim redundant whitespace in localized files.