Language specific text extractions

Hello experts,

In a fresh BI system, if i have to extract data for 0customer_text for eg with language selection, what r the detailed steps for doing it?

the datasrc does not have a langu field. i want to extract only german records in BI? how do i enable this?

Similarly do i need to do this for all the other text datasrces which dont have langu field?

the configurations are done on a system with English language logon but the data to be extracted is in German!!

Detailed steps would be appreciated.

thnk you