I couldn't find any method to switch the language per-user from within the desktop environment in LXDE, but setting the user's locale to German.
This can easily be done using the "raspi-config" tool and then choose "change_locale".
In fact, this is just calling the Debian package system to reconfigure "locales":
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dpkg-reconfigure locales
Now, select the language you also want to be supported. In my case it was:
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de_AT.UTF-8 UTF-8
The next time you enter the X11 environment with LXDE, everything will be in German.
TIP:
In order to have different language settings for different users.
Therefore, if you add the following line to your "~/.bashrc", you can set the language per-user:
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export LANG="en_GB.UTF-8"