"Forever" if you want, but available if you re-enable it by ticking the checkbox.
There should be a way to get the German version from the repositories - someone can probably tell you or you can do a search of the forums.
On the link I gave you, below the OS selection was a language selection. German is available if you would prefer to install it manually. Download the .deb file and double-click - it should install. Ausgezeichnet!
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