German l10n update

This refines and improves the German translation of some l10n strings. The performed changes are reflected on Transifex already.

changed milestone to %3.2.3

added Beginner friendly Minor + 1 deleted label

added 3 commits

• dd4d8247...05016600 - 2 commits from branch videolan:master
• 68d1c58f - l10n: update and refine German translation

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added 4 commits

• 68d1c58f...7b717314 - 3 commits from branch videolan:master
• 8708d076 - l10n: update and refine German translation

Compare with previous version

merged