update German translation (Hotkeys) - #2190

Awesome, thanks @horst-p-w-neubauer.

@FriedrichFroebel I'm merging this in now. If something in it needs changing though, let us know. 😄

As long as it works better with it (or just improves understandability without breaking anything), I am fine with it. From time to time I may miss some strings or parts of it (or mis-translate it) and I usually do not test the complete DB4S application with the translations - so some of the German translations may need fixes like in this PR.

@FriedrichFroebel , I'm preparing an update where I consequently translate 'record' to 'Datensatz'. Actually it switches between 'Zeile' and 'Eintrag'. That update would bring a lot of changes to the translation and I'd prefer to discuss it in advance. I absolutely vote for strict 1:1 transaltion for technical terms like record or row. But I swing between 'Datensatz' or 'Eintrag'. What would You prefer?

I would probably prefer the term "Datensatz" in this case. (As I did the translations across multiple days and for different releases, some other translations might be inconsistent as well.)

I agree. Is there a possibility to share a dictionary and other translation-decissions? That would help to work in teams and to be strict over time and releases.

For the Spanish translation, I like to take a look at the hints and glossary of the KDE Spanish Translation Project. There is an equivalent German project too, which seems very interesting and complete. It includes even a "visual dictionary". Of course, very specific terms used in DB4S should be agreed separately, because they might be missing in KDE.

As I do not have any overview about my decisions, I cannot share a dictionary for now. But feel free to create one if you have enough time - either as a working draft inside a dedicated issue, inside the wiki on a page regarding translations in general or by contacting me using e-mail to discuss it (my e-mail is should be available from my commits when viewed locally.)