Merge pull request #1693 from Giacom/fix_1691

Fixes #1691 by limiting the show_message proc.
hey so can i just type whatever i want in here when i merge something?

code/modules/mob/mob.dm

@@ -38,6 +38,8 @@ var/next_mob_id = 0
 
 	if(!client)	return
 
+	msg = copytext(msg, 1, MAX_MESSAGE_LEN)
+
 	if (type)
 		if(type & 1 && (sdisabilities & BLIND || blinded || paralysis) )//Vision related
 			if (!( alt ))