* Big, mundane clean up and edit of (error/ok/etc)

messages and pupmenu()s. Edited spelling and grammar,
 stylistic consistency, etc.

I added the guidelines and rationale that I used to the
 CMS here:
http://www.blender3d.org/cms/Language_and_terminology.338.0.html

Next step is to get icons in there, to make it easier to see
 at a glance what sort of message (and how much attention
 should be paid to it, or if it can be dismissed with a flick
 of the mouse, eg. boring remove doubles notifications)

mockup: http://mke3.net:9000/blender/ui/controls/error_ok_icons.png

source/blender/src/drawscript.c

@@ -120,7 +120,7 @@ void winqreadscriptspace(struct ScrArea *sa, void *spacedata, struct BWinEvent *
 	}
 	else {
 		if (event == QKEY)
-			if (val && okee("QUIT BLENDER")) exit_usiblender();
+			if (val && okee("Quit Blender")) exit_usiblender();
 	}
 
 	return;