Sequencer

"Insert Gap" and "Remove Gap" tooltip fix - to denote this doesn't use selection.
The use of this tool is to insert or remove time for a timeline. 



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55630 954f8c5b-7b00-dc11-b283-0030488c597c