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

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

features/eid_bagofcrafting_search.lua

@@ -57,7 +57,7 @@ end
 
 EID:AddCallback("EIDCallbacks.SEARCH_NAME_CONVERSION", function(_, searchString)
 	-- TODO : make english search inside ko_kr language setting (priotity low though)
-	if EID:getLanguage() == "ko_kr" then
+	if EID:getLanguage() == "ko" then
 		return EID.engKeystrokeToKor(searchString)
 	end
 end)