fix

code/datums/dna.dm

@@ -386,6 +386,13 @@
 			qdel(language_holder)
 			var/species_holder = initial(mrace.species_language_holder)
 			language_holder = new species_holder(src)
+
+			//provide the user's additional language to the new language holder even if they change species
+			if(additional_language && additional_language != "None")
+				var/language_entry = GLOB.roundstart_languages[additional_language]
+				if(language_entry)
+					grant_language(language_entry, TRUE, TRUE)
+
 		update_atom_languages()
 
 /mob/living/carbon/human/set_species(datum/species/mrace, icon_update = TRUE, pref_load = FALSE)

code/modules/client/preferences.dm

@@ -3070,6 +3070,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	if(additional_language && additional_language != "None")
 		var/language_entry = GLOB.roundstart_languages[additional_language]
 		if(language_entry)
+			character.additional_language = language_entry
 			character.grant_language(language_entry, TRUE, TRUE)
 
 	//limb stuff, only done when initially spawning in

code/modules/mob/living/carbon/human/human_defines.dm

@@ -81,6 +81,8 @@
 
 	tooltips = TRUE
 
+	var/additional_language //the additional language this human can speak from their preference selection
+
 /// Unarmed parry data for human
 /datum/block_parry_data/unarmed/human
 	parry_respect_clickdelay = TRUE