Lang files are not a part of the project.

If you want to use the code of these tools, feel free to decompile and use them without restrictions.(Though the code is messy and bad)

hexosse wrote his own version of these tools, check it out: https://github.com/hexosse/LanguageUtilsTools

Copy ExportLangFiles.jar to .minecraft\assets folder and run the program. It will generate a output/ folder with lang files in it.

Modify the lang files(Reduce useless parts) to achieve higher efficiency. Just run it in this folder. Generated files will locate at lang/modified/. If you want to just export Item names, add argument, onlyItems.

Generate code for EnumLang class. Run it in this folder, and it will generate a output file.

Generate code for EnumLang class. Run it in this folder, and it will generate a output file. Still need to fill in Material data.