bbb-lti: Changed the main tool title shown by the lti cartridge

Conflicts:
	bigbluebutton-client/src/org/bigbluebutton/modules/chat/views/ChatMessageRenderer.mxml

Fixed broadcast module issue #1639

User settings menu repositioned

Check for corrupt video files, don't attempt to render them

A corrupt video file is defined as one where ffprobe either finds no
video stream, or it finds a video stream but cannot read any frames.

related to exceptions when you try to log out of the session

update locales and add welsh

0.8 is the default version set for all the "locales", with the value 0.81 it fails while loading the client in the browser. I also changed it in Transifex.

   fix: https://code.google.com/p/bigbluebutton/issues/detail?id=1642

 - remove tracking of how many unread private tabs a user has as we don't really need that level of detail
   - fix: https://code.google.com/p/bigbluebutton/issues/detail?id=1640

   https://code.google.com/p/bigbluebutton/issues/detail?id=1641

Fixed broadcast module not showing for clients, multiple windows opening for presenter and stream not playing if joining once the stream was started

Make generation of png images for pdf pages more resiliant.

We now use ghostscript to output pngs directly from the original pdf,
rather than using convert on the split pages. This should make corrupt
or strange pdfs less likely to cause issues.

As well, if a pdf page conversion fails (for any reason, including that
the original pdf is missing...) it will be logged, and a blank page
generated, and processing will continue.

fixes audio  extension problem in matterhorn

update locales

matterhorn scripts work with new version of ffmpeg