We have English as the default language however some users want to change it as per their convinience. They can do it via profile settings. However, when weekly HR / user data feed is interfaced, it overrides back to English. We made some changes to interface with example of German, langunage is changed in the Default Language field but not saved. Still all of the concur menu is in English when logged in after the change.
I need to understand if we need to change / append any other field so that when user logs in, automatically he/she sees the page in new language.
In this case i would make sure that the language field is not used as overwriting field. In your place I coordinate with the people in charge of the masterdata employee file upload or having the upload only for the people that are new on the system or that changed departments/cost center.