German Greeter translation uses "s" accelerator twice

Originally created by @anonym on #13635 (Redmine)

Both for Sprache and Tails starten, so the Alt+s keyboard shortcut doesn’t do anything. IMHO we should use notextile>Sprache and Tails starten.

Related issues

Related to #14457 (closed)
Blocks #10261 (closed)

Edited May 15, 2020 by anonym

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