[pitivi] (14 commits) ...Merging translations

[Edward Hervey <edwardrv src gnome org>]

Summary of changes:

  f4842ce... Set project.uri the first time we save a new project.
  5556643... Sync sensitiveness of the render button when a project is l
  000bd3f... Add some debugging to the ETree formatter.
  9c4166b... Change a bunch of __repr__ to __str__.
  d7262e0... Ooops looks like i missed a __repr__.
  4215225... Remove ObjectFactory.displayname. YAGNI.
  e3e4af3... Remove bogus FileSourceFactory._releaseBin.
  328f503... Fix a bug adding clips to the timeline introduced by 421522
  2392a56... Refactor source factories a bit.
  2ebbd62... Refactor pitivi.sourcelist. Tweak missing-plugin handling.
  f9059da... git add pitivi/sourcelist_undo.py
  8431d25... Connect to the delete-event so we can stop pitivi from clos
  19198bf... Remove an avoidable loop plotting waveforms. Micro optimiza
  116737e... Merging translations