Advanced Netherite 2.1.6 for Minecraft 1.21

🌎 Create fr_fr.json (Thanks JustArthur)
🌎 Update ko_kr.json (Thanks smoong951)
🌎 Update ru_ru.json (Thanks Rem_u)
🐛 Solve breaking changes in NeoForge 21.0.74
🐛 Fix typo in config comment
🐛 Fix it_it translation not working