Right-clicking radio stream gives traceback

[Dafydd Crosby]

Currently in the trunk build, when you right-click a stream you get a traceback:

Traceback (most recent call last):
  File "/home/dafydd/exaile/xlgui/guiutil.py", line 211, in button_press
    return self.cont.button_press(button, event)
  File "/home/dafydd/exaile/xlgui/panel/radio.py", line 199, in button_press
    menu = station.get_menu(self)
  File "/home/dafydd/exaile/data/plugins/shoutcast/__init__.py", line 207, in get_menu
    menu.append(_("Search"), lambda *e: self.on_search(), 'gtk-find')
NameError: global name '_' is not defined

[Dafydd Crosby (dcrosby)]

bzr commit 1797 fixed it. Thanks!