Print warnings when invalid py dict/key/value is found in translations data (do not error here, this is not critical and can be ignored/skiped, and it would break translations for other addons as well).

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53955 954f8c5b-7b00-dc11-b283-0030488c597c