If you installed Gimp for XYZ language and then installed the help files for XYZ laguage, the first thing you should check is in Edit -> Preferences -> Interface and see if your language is in the drop down list.
If you installed Gimp for XYZ language and then installed the help files for XYZ laguage, the first thing you should check is in Edit -> Preferences -> Interface and see if your language is in the drop down list.