Anyone can help out with translations for Tasks. Please visit Task's GetLocalization project page to get involved. Feel free to add your language if it does not already exist on GetLocalization
Note: Some strings contain special formatting characters such as '%s', '\n', and '%1$s' that need to be preserved. For example in the string "Task Saved: due %s," %s is a placeholder for the task due date. If you remove these special formatting characters then Tasks will not be able to plug in the necessary values.