Bunch of fixes for py ui messages (all those using 'formating' were not translated previously, now they use bpy.app.translations.pgettext). Also pleas avoid complex py statements in 'text' values (like 'text="foo" if cond else "bar"'), thes make message extraction script fails!

And another "final point in UI message" removal!

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54414 954f8c5b-7b00-dc11-b283-0030488c597c