i see now, the problem isn't in invoice, but in quotation.
Using din5008 template

thanks for your answer

i try follow variations

1. goto settings
2. goto translation -> export
3. chose the language
4. chose .po
5. filter 5008 in app and chose all 5008 translations
6. click export and download file
7. open file in POEdit
8. in this file i can see, that the wrong label description has no entry
9. i fix the missing translation with the correct german word
10. save the file and close POEdit
11. goto Odoo
12. import translation
13. write >German / Deutsch< in the field language
14. write >de_DE< in the field code
15. chose file
16. activate the >change translation<
17. click import

Now i check the Output and nothing happen.

I export in the same way above and also with the variation .csv with editor and see, that the changes i made not exist.

did I forgot something?