[pitivi] (41 commits) ...Merging translations

[Thibault Saunier <tsaunier src gnome org>]

Summary of changes:

  1e7aeae... Revert "Force the play button to be visible, regardless of 
  80df43d... Enforce showing icons in the play/pause button
  4878b26... Enforce showing icons in gstwidget's reset buttons
  a960f9d... Enforce showing icons for the InfoStub question button
  64cf9ce... Enforce showing icons in the timeline "Zoom" button
  cc9747c... prefs.py: use icons for reset buttons for consistency
  5842bb6... Fix mass-deletion bug, #634723
  ebebe2d... Actually import collections as needed.
  b2ce298... Disable updates during deletion Suggested by thiblahute.
  d6e937f... formatter: Make sure to have same char encoding format when
  4021dd2... test: Don check PipelineError is raised in GetReleaseTeeFor
  0f96c64... Oops, removing prints introduced with d6e937
  5bf443c... previewer: allow specifying thumbnail period
  3f1bcbb... previewer: change thumbnail period slider to combo box
  aa8c993... Use translatable strings for thumbnailing periods
  fc15c37... Rearrange thumbnailing-related settings into a Performance 
  cb607f0... Use sentence capitalization for preference labels
  0a7d3e5... Standardize spacing
  88f19d2... Increase thumbnailing period to one second for better perfo
  6aee8e9... Correct some important trivia
  be03c3e... Properly attach the label to checkbuttons for dynamic Toggl
  69ee4be... Attach the label to checkbuttons for ToggleWidgets in gstwi
  b81f5d9... Add tooltips to preference widgets
  fa40567... Clarify the wording of preferences
  a31e63f... Initialize project metadata properly and load them into the
  786fab9... Save metadata within the formatters
  88bbfe5... Bump the Gtk dependency to 2.24
  1c4d249... Add a check for soft dependencies on startup
  f6bc3cf... Create a missing dependencies dialog
  9e28177... Show the list of missing packages in the dependency manager
  495f3c2... Make the dependencies manager a modal window
  a1a791f... Add sample code for installing dependencies
  83e7a72... Turn numpy into a "soft dependency"; disable autoalign if i
  0153fcc... Show the missing dependency dialog when trying to align and
  ed4915e... Initial commit for the Mallard-formatted user manual coveri
  ca282bc... manual: Document effects, the welcome dialog, zoom fit, etc
  1c62cb8... manual: new Main Window screenshot, rename "source list"
  95c1dec... Integrate the user manual with the application package
  0c3f8f6... Added a target for building the user manual into HTML files
  999025b... Created utils.show_user_manual which tries to open the offl
  433c4b6... Merging translations