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.lua

@@ -1150,7 +1150,7 @@ function EID:handleBagOfCraftingRendering(ignoreRefreshRate)
 		-- Nothing in our recipe list passed the test; try checking English names as a backup
 		if #IDsToCheck == 0 then
 			local curLang = EID:getLanguage()
-			EID.Config["Language"] = "en_us"
+			EID.Config["Language"] = "en"
 			for _,id in ipairs(sortedIDs) do
 				local searchValid = EID:BoCSCheckItemName(EID:getObjectName(5, 100, id))
 				if (searchValid) then table.insert(IDsToCheck, id) end