Mostly, "weight groups" -> "vertex groups", and usual case/endpoints/typos/etc. As a remainder, please read http://wiki.blender.org/index.php/Dev:Doc/CodeStyle#UI_Messages before writing UI messages!
Mostly, "weight groups" -> "vertex groups", and usual case/endpoints/typos/etc. As a remainder, please read http://wiki.blender.org/index.php/Dev:Doc/CodeStyle#UI_Messages before writing UI messages!