* 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/interface.c

@@ -4232,7 +4232,7 @@ short pupmenu(char *instr)
 	if(strncmp(laststring, instr, UI_MAX_NAME_STR-1)!=0) lastselected= 0;
 	BLI_strncpy(laststring, instr, UI_MAX_NAME_STR);
 	
-	startx= mval[0]-width/2;
+	startx= mval[0]-(0.8*(width));
 	if(lastselected>=0 && lastselected<md->nitems) {
 		starty= mval[1]-height+boxh/2+lastselected*boxh;
 	}