added some german translations

[Z3hka]

Description

I read a complaint about missing translators for fish on mastodon so i translated a few strings into German

TODOs:

• Changes to fish usage are reflected in user documentation/manpages.
• Tests have been added for regressions fixed
• User-visible changes noted in CHANGELOG.rst

[faho]

(doing review in english so that others have an idea what I'm doing)

This looks nice, overall, but I have some suggestions and found some typos.

[Xiretza]

Looks good overall, a couple nits from me as well. Thanks!

[Xiretza]

grammar nit:

Suggested change

	msgstr "TERM Umgebungsvariable nicht gesetzt."
	msgstr "TERM-Umgebungsvariable nicht gesetzt."

[Xiretza]

This is the label for the pager search field, I think the noun makes more sense than the imperative verb here.

Suggested change

	msgstr "suche: "
	msgstr "Suche: "

[Xiretza]

I think this actually has to be named sources.list, maybe put it in quotes?

[Z3hka]

That was me following the linter to blindly :D

[faho]

Okay, that last commit is a bit of a mess.

It includes thousands of changes of the form

-#: /tmp/fish.i8YroE/explicit/share/functions/fish_delta.fish:2
-#: /tmp/fish.i8YroE/explicit/share/functions/fish_delta.fish:5
+#: /tmp/fish.i8YroE/explicit/share/functions/fish_delta.fish:2 /tmp/fish.i8YroE/explicit/share/functions/fish_delta.fish:5

which makes it very hard to find the actual changes. If you can, it would be cool to remove those bits and leave the actual changes.

[Z3hka]

I guess some cross-os linebreak incompatiliblities happene. I force-pushed the commit before it and will add the changes back later

[faho]

Okay, I've now removed the unnecessary changes, and I'm going to merge this now.

If I've missed anything, which is easily possible because I searched through 15000 lines for changed msgstrs, feel free to yell or open another PR!