Own German translation no longer works

Since the last update, my German translation no longer works.

I had downloaded the .pot file, created a German translation with POEdit, uploaded the new files event-post-de_DE.mo event-post-de_DE.po into /languages/.

Worked fine with the version before. I have a Polylang blog and it switched correctly between German and English.

Now it seems to be ignored.

What can cause this problem?

Thanks.

PS My German translation is appr. 70% finished. When it’s ready, you can have it of course.