I’m glad you asked, because there’s plenty of them, for example these ones:
Move core packages’ translations to plone.app.locales
There a step by step tutorial on the first message and plenty of packages to choose from.
World Plone Office Day is 3 weeks away only so, whether you are hosting one office day or you are thinking of to attend it, be sure to get a list of easy tasks to do for newcomers.
Happy hacking!