Local Language Versions in SQL Server
SQL Server supports all languages that are supported by Windows operating systems.
Cross-Language Support
- The English-language version of SQL Server is supported on all localized versions of operating systems. 
- Localized versions of SQL Server are supported on localized operating systems with the corresponding language or on English-language versions of supported operating systems by using the Windows Multilingual User Interface Pack (MUI) settings. For more information, see How to: Change Operating System Settings to Support Localized Versions. 
- Localized versions of SQL Server can only be upgraded to localized versions of the same language, and cannot be upgraded to the English-language version. 
- Localized versions of SQL Server can also be installed side by side with English-language instances of SQL Server.