Language and Larynx Additions (#5402)

* Various Language Improvements

code/modules/mob/language/language.dm

@@ -133,7 +133,15 @@
 	return speech_verb
 
 /datum/language/proc/can_speak_special(var/mob/speaker)
-	return 1
+	. = TRUE
+	if(ishuman(speaker))
+		var/mob/living/carbon/human/H = speaker
+		if(src.name in H.species.assisted_langs)
+			. = FALSE
+			var/obj/item/organ/internal/voicebox/vox = locate() in H.internal_organs	// Only voiceboxes for now. Maybe someday it'll include other organs, but I'm not that clever
+			if(vox)
+				if(!vox.is_broken() && (src in vox.assists_languages))
+					. = TRUE
 
 // Language handling.
 /mob/proc/add_language(var/language)