LXDE mintinput crash

[MenthaSuaveolens]

When I want to change the Keyboard and Mouse-preferences no dialog pops up. When I execute mintinput in the commandline, the following error-report is generated:

~ $ mintinput
Traceback (most recent call last):
File "/usr/lib/linuxmint/mintinput/mintinput.py", line 26, in <module>
gettext.install("mintinput", "/usr/share/linuxmint/locale")
File "/usr/lib/python2.7/gettext.py", line 508, in install
t = translation(domain, localedir, fallback=True, codeset=codeset)
File "/usr/lib/python2.7/gettext.py", line 493, in translation
t = _translations.setdefault(key, class_(fp))
File "/usr/lib/python2.7/gettext.py", line 180, in __init__
self._parse(fp)
File "/usr/lib/python2.7/gettext.py", line 337, in _parse
tmsg = unicode(tmsg, self._charset)
LookupError: unknown encoding: CHARSET

Is there a way to circumvent this problem?