This was made to allow community to translate untranslatable things in minecraft like splashes or end text. You dont have to follow any glossary but it is recommended to do!
Simple community project not affiliated with Mojang AB. nor Minecraft itself as it is run by a member of the community.
You need to create an account on Crowdin, then you can translate in this link: https://crowdin.com/project/mcsplashes just search up your language, pick it and pin the web
Click on a green "code" button and click on "download zip". Open downloaded zip file, Splash text translations and your language named folder. There is another README for help.