[NO GBP] Quickfix for a now removed status flag (also byond issue). (#86680)

## About The Pull Request
Making the code compile. EDIT: There's an on-going BYOND issue with
datum subtypes (not atoms) in which trying to override the parent value
with null won't work. Melbert has provided me a fix for it too (from:
https://github.com/tgstation/tgstation/pull/86666/commits/d6c1dbf4fd641d160961d7964e145e93b86d672c)

## Why It's Good For The Game
Making the code compile and the CI succeed

## Changelog
.

code/modules/language/_language_holder.dm

@@ -37,10 +37,10 @@ Key procs
 
 /datum/language_holder
 	/// Lazyassoclist of all understood languages
-	var/list/understood_languages = list(/datum/language/common = list(LANGUAGE_ATOM))
+	var/list/understood_languages
 	/// Lazyassoclist of languages that can be spoken.
 	/// Tongue organ may also set limits beyond this list.
-	var/list/spoken_languages = list(/datum/language/common = list(LANGUAGE_ATOM))
+	var/list/spoken_languages
 	/// Lazyassoclist of blocked languages.
 	/// Used to prevent understanding and speaking certain languages, ie for certain mobs, mutations etc.
 	var/list/blocked_languages
@@ -503,14 +503,21 @@ GLOBAL_LIST_INIT(prototype_language_holders, init_language_holder_prototypes())
 		/datum/language/nekomimetic = list(LANGUAGE_ATOM),
 	)
 
+// Given to atoms by default
+/datum/language_holder/atom_basic
+	understood_languages = list(/datum/language/common = list(LANGUAGE_ATOM))
+	spoken_languages = list(/datum/language/common = list(LANGUAGE_ATOM))
+
+// Explicitly empty one for readability
 /datum/language_holder/empty
 	understood_languages = null
 	spoken_languages = null
 
+// Has all the languages known (via "mind")
 /datum/language_holder/universal
 	understood_languages = null
 	spoken_languages = null
 
 /datum/language_holder/universal/New()
 	. = ..()
-	grant_all_languages()
+	grant_all_languages(source = LANGUAGE_MIND)