Many thanks for your fast reply.
I did everything as you described.
With Poet the translation worked 100% and I uploaded it.
After that in Core and Theme it showed 100%. After I synced the percentage moved down.
Also some translation works, like “buy now” is now in German language. But some do not work, although they are translated. For example ” Categories” and “Filter by price, I have posted the Link in the Private content area.