Thank You Paolo, that worked out, i just had to rename the files. I downloaded the files here: https://wpgeodirectory.com/translate/projects/geodirectory/de/default/ (by clicking on “export” . I just did it again and the filename ist the same (without DE_de, just _de), so i didn’t think of that.
Anyhow, issue resolved by renaming the files DE_de and ES_es, thank you very much.
Benjamin