If you want to help check the label PR-Welcome. Its always a good idea to talk about what are going to do before you actually start it, so frustration can be avoided.
Some rules for coding:
- Use the code style the project uses
- For each feature, make a separate branch, so it can be reviewed separately
- Use commits with a good description, so everyone can see what you did
The project page is on weblate. There all the localizations are maintained. If you want to contribute, check if there are untranslated or wrong translated words.
Or you can start translating a new language if you speak it ;-)