Feat/reworked language codes (#865)

* Reworked language codes to use Steam localization standards

* Reworked language codes tweaks (#864)

* Language code rework tweaks

* Update bg.lua

* Reevaluate whether a language is WIP

* Update bg.lua

* Even better mark for languages as WIP (> 80% translated)

* Update zh_cn.lua

* Update cs.lua

* Fix for game language codes

---------

Co-authored-by: kittenchilly <mario.pikmin.zelda@gmail.com>

features/eid_holdmapdesc.lua

@@ -615,7 +615,7 @@ function EID:ItemReminderHandlePoopSpells(player)
 
 					local ignoreExisting = false
 					if customPoop == nil then --If the poop still doesn't exist, use the unkown one instead
-						customPoop = EID:getDescriptionEntry("poopSpells")["Unknown"] or EID.descriptions["en_us"]["poopSpells"]["Unknown"]
+						customPoop = EID:getDescriptionEntry("poopSpells")["Unknown"] or EID.descriptions["en"]["poopSpells"]["Unknown"]
 						ignoreExisting = true
 					end