Languge Pack columns headings issue for Project Server 2010 after installing June Cumulative update
Webpart Column Headings are in english after installing Sp1 + June Cumulative Update if you have installed any language packs before. All column headers in the Project Center and Resource Center grids appear in English, regardless of the selected UI language.
This issue has been fixed with the December Cumulative Update. If you still encounter any problems with this please contact the Microsoft support.