For a project I liked I saw that the translation of the UI was only about 1% complete for my native language. I decided to dedicate the weekend to get it above 95%. This was apparently the part that seemed too hard for most to make a dent in, but across several new versions my language is still 100%. I think my groundwork made it easier for some sporadic contributors to get a small bit of dopamine when updating the few new strings in a release to see it hit 100% again.