Moves languages to a holder datum, gives mind its own language holder

code/controllers/subsystem/language.dm

@@ -0,0 +1,18 @@
+SUBSYSTEM_DEF(language)
+	name = "Language"
+	init_order = INIT_ORDER_LANGUAGE
+	flags = SS_NO_FIRE
+
+/datum/controller/subsystem/language/Initialize(timeofday)
+	for(var/L in subtypesof(/datum/language))
+		var/datum/language/language = L
+		if(!initial(language.key))
+			continue
+
+		GLOB.all_languages += language
+
+		var/datum/language/instance = new language
+
+		GLOB.language_datum_instances[language] = instance
+
+	return ..()