Documentation: Explain translators how to change strings

[Echolon]

• Or we improve the function on weblate, which I personally think is more suitable for translators. I thought this is working.

[FriedrichAltheide]

[...] improve the function on weblate [...]

What do you want to improve?

[tmolitor-stud-tu]

change what strings?

[Echolon]

People seem start to edit the wrong localization files (actually the localization files) and the Weblate edit function of the root strings does not work seemingly. Hence, I thought this should be discussed or described.