[2.6.0] Support for MC 1.21.3 & 1.21.4

Major changes :

• Add support for Minecraft 1.21.3 & 1.21.4 (1.21.2 isn't added, because Spigot include it in 1.21.3). Big thanks to @BAD7777 for the help
• Add support to language ru. Again big thanks to @BAD7777

Minor changes :

• Fix properties of MC between 1.20.0 and 1.21.0 wasn't included in MC 1.21.1.