Thank you! I have been away, hence my belated reply. So now my translation is in the master branch, right?
I have downloaded a book on Git and will study it carefully before trying to contribute again. I basically understand the Git concept, but what often has confused me are some terms which - at least for me - have not been defined and explained sufficiently clearly. Explanations often sound like being from programmers for programmers, which I am not at all.

Yes, it's in master and in 4.0.3 release.

Good study of Git! :-)

As for the small problems I have mentioned earlier already (Grace Notes and that mixed English-German error message): I will open a new issue to keep things organized.

First, however, I will install the latest Frescobaldi version on my machine and see if they are still there. BTW: the annoying bilingual context menu (when you right-click in the editor) is gone now - we talked about it when it occurred in FB 3.3.0.