1. Open file %appdata%/Need For Speed World/Settings/UserSettings.xml
2. Find line <Language Type="string">EN</Language> [LINE: 595]
3. Replace EN with:
- EN - English
- PL - Polish
- DE - German
- FR - French
- RU - Russian
- PT - Portuguese
- ES - Spanish
- TH - Thai
- TR - Turkish
4. Save!
Enjoy NFS:W offline in your national language!