Considerations for Multi-Lingual Environments
SharePoint Foundation 2010 and SharePoint Server 2010 products are available in many more languages than SQL Server
When you configure a report server to run within a deployment of a SharePoint product, you might see a combination of languages. The user interface, documentation, and messages will appear in the following languages:
All application pages, tools, errors, warnings, and messages that originate from Reporting Services will appear in the language used by the Reporting Services instance in one of the SQL Server languages.
Application pages that you open on a SharePoint site, the Report Viewer Web Part, and Report Builder will appear in one of the supported languages for the Reporting Services Add-in. To view the list of supported languages, go to SQL Server Downloads and find the download page for the Reporting Services Add-in.
SharePoint sites, SharePoint Central Administration, online help, and messages are available in the languages supported by Office Server products.
If the language of your SharePoint product or technology differs from the report server language, Reporting Services will try to use a language from the same language family that provides the closest match. If a close substitute is not available, the report server uses English.
For more information about language support in Reporting Services, see International Considerations for Reporting Services on msdn.microsoft.com or Solution Design Considerations for Multi-Lingual or Global Deployments (Reporting Services) in SQL Server Books Online.