comicthumb fails to run

[City-busz]

I get the following error every time when I try to run it:

Traceback (most recent call last):
  File "/usr/share/mcomix/comicthumb.py", line 24, in <module>
    from mcomix import thumbnail_tools
  File "/usr/share/mcomix/mcomix/thumbnail_tools.py", line 16, in <module>
    from mcomix import archive_extractor
  File "/usr/share/mcomix/mcomix/archive_extractor.py", line 7, in <module>
    from mcomix import archive_tools
  File "/usr/share/mcomix/mcomix/archive_tools.py", line 14, in <module>
    from mcomix.archive import (
  File "/usr/share/mcomix/mcomix/archive/__init__.py", line 5, in <module>
    from mcomix import main
  File "/usr/share/mcomix/mcomix/main.py", line 14, in <module>
    from mcomix import event
  File "/usr/share/mcomix/mcomix/event.py", line 10, in <module>
    from mcomix import keybindings
  File "/usr/share/mcomix/mcomix/keybindings.py", line 36, in <module>
    from mcomix import keybindings_map
  File "/usr/share/mcomix/mcomix/keybindings_map.py", line 5, in <module>
    'previous_page': {'title': _('Previous page'),
NameError: name '_' is not defined