To help with translations check transifex
For this you can create a .qss file in rare/resources/stylesheets directory or modify the existing RareStyle.qss file. Here are some examples: Qt Docs
Select one Card of the project and implement it, or if you want to add another feature ask me on Discord, or create an issue on GitHub
To contribute fork the repository and clone your repo: git clone https://github.com/YourName/Rare Then make your changes, add changed files to git with git add File.xy rare/other_file.py
and upload it to GitHub with git commit -m "message" and git push. Some IDEs like PyCharm can do this automatically.
If you uploaded your changes, create a pull request