Diona nymph hivemind fix and custom food

- You can now only put food into custom food, no more "the fire
extinguisher glass shard telescopic baton personal pizza"
- Fixes nymphs being able to learn hivemind languages.

code/modules/mob/living/carbon/monkey/diona.dm

@@ -221,7 +221,8 @@
 	src.visible_message("\red [src] flicks out a feeler and neatly steals a sample of [M]'s blood.","\red You flick out a feeler and neatly steal a sample of [M]'s blood.")
 	donors += M.real_name
 	for(var/datum/language/L in M.languages)
-		languages |= L
+		if(!(L.flags & HIVEMIND))
+			languages |= L
 
 	spawn(25)
 		update_progression()