mintinput crash on LXDE

[Bernard Decock]

The dialog for setting Keyboard and Mouse-preferences doens't open. When mintinput is executed from the command-line,
the following error-report is returned.

~ $ 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