Traceback (most recent call last):
  File "/usr/local/bin/gnome-tweak-tool", line 84, in <module>
    MainWindow()
  File "/usr/local/bin/gnome-tweak-tool", line 47, in __init__
    model)
  File "/usr/lib/python2.7/site-packages/gtweak/tweakview.py", line 40, in __init__
    self._model.load_tweaks()
  File "/usr/lib/python2.7/site-packages/gtweak/tweakmodel.py", line 132, in load_tweaks
    mods = __import__("gtweak.tweaks", globals(), locals(), tweak_files, 0)
  File "/usr/lib/python2.7/site-packages/gtweak/tweaks/tweak_shell_extensions.py", line 167, in <module>
    ShellExtensionTweakGroup(),
  File "/usr/lib/python2.7/site-packages/gtweak/tweaks/tweak_shell_extensions.py", line 138, in __init__
    TweakGroup.__init__(self, _("Shell Extensions"))
NameError: global name '_' is not defined