Starting with other language file

I hope it's okay when I ask a few newbie questions.
In backend I go the the Joomdonation component, go to Translations. The page started with the en-EN-language file. For the de-DE file I copied the English file to the de-DE folder and renamed to de-DE.com_jdonation.ini
To this tep it's all okay.
How can I manage, when I click in the dashboard of the component on Translations, start first with the de-DE language file?

Hi Michael,
In fact, you don't need to create language files for other languages manually. You just need to filter language through Translation tool at Back-end of Joom Donation and translate language files from English to different languages. After saving Translation form, the language files of new language will be created and stored in corresponding directory.
Thanks
Dam

How ever, when I start the translation management in Joomdonation backend, it starts ever with the en-GB file. I must ever switching from en-GB to de-DE above the table and can now editing in the right language-file. But, when I saved, the translation management every switching back to the en-GB file. Why can't believe the translation management to the de-DE-file? For my Joomla is the de-DE saved for standard.

Hi Michael,
It's strange issue, please submit ticket and send your url with super admin account. I'll check the issue for you
Thanks
Dam