If you like Keka and have some Xcode and grammar skills, make it speak your language!
What to do here
In the Current Translations folder you have all the updated files of the translations. You can simply update them and send a pull request.
If you like, you can use the "Keka Translator.app" (using Xcode) to translate and test your files before uploading them. Just clone the project, open the Project file and follow the instructions there. Just remember to place the translated files you've created/updated in the correct folder inside Current Translations folder.