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>

descriptions/ab+/fr.lua

@@ -13,10 +13,11 @@
 
 local languageCode = "fr"
 
--- init fr table
+-- init French table
 EID.descriptions[languageCode] = {}
 EID.descriptions[languageCode].custom = {} -- table for custom entity descriptions
 EID.descriptions[languageCode].languageName = "French"
+EID.descriptions[languageCode].alternativeLanguageCodes = {"french"}
 
 -- Fonts to be used with this language pack
 EID.descriptions[languageCode].fonts = {{name="default", textboxWidth = 145}, {name="inverted", textboxWidth = 145}, {name="borderless", textboxWidth = 145}}