Unable to close new playlist tab

[Graham Whelan]

An exception is raised when trying to close the tab of a newly created playlist.

Test case:
Create a new playlist, add a track to it and then hit the close button on the playlist's tab.

Result:
Traceback (most recent call last):
  File "/home/user/opt/lib/exaile/xlgui/main.py", line 177, in do_close
    if self.page.on_closing():
  File "/home/user/opt/lib/exaile/xlgui/playlist.py", line 373, in on_closing
    dialog = ConfirmCloseDialog(self.playlist.get_name())
  File "/home/user/opt/lib/exaile/xlgui/playlist.py", line 860, in __init__
    self.set_title(_('Confirm Close'))
NameError: global name '_' is not defined

This is because gettext is not being imported in the file xlgui/playlist.py.

I've attached a patch to fix this.

[reacocard (reacocard)]

committed in r1819