Languages now use alternative prefix keys.

Makes radio and language key overlaps possible.
It is possible to configure the default language keys server side.
Pending: The possibility for players to configure their own language keys.

code/modules/client/preferences.dm

@@ -76,6 +76,7 @@ datum/preferences
 	var/species = "Human"               //Species datum to use.
 	var/species_preview                 //Used for the species selection window.
 	var/list/alternate_languages = list() //Secondary language(s)
+	var/list/alternate_language_prefixes = list() //Alternative language prefixes
 	var/list/gear						//Custom/fluff item loadout.
 
 		//Some faction information.

code/modules/client/preferences_savefile.dm

@@ -110,8 +110,11 @@
 	S["spawnpoint"]			>> spawnpoint
 
 	S["language"]			>> alternate_languages
+	S["language_prefixes"]	>> alternate_language_prefixes
 	if(isnull(alternate_languages))
 		alternate_languages = list()
+	if(isnull(alternate_language_prefixes))
+		alternate_language_prefixes = config.language_prefixes.Copy()
 	if(!islist(alternate_languages))
 		if(client)
 			// Warn them that we (probably) just broke their languages
@@ -287,6 +290,7 @@
 	S["age"]				<< age
 	S["species"]			<< species
 	S["language"]			<< alternate_languages
+	S["language_prefixes"]	<< alternate_language_prefixes
 	S["hair_red"]			<< r_hair
 	S["hair_green"]			<< g_hair
 	S["hair_blue"]			<< b_hair