Hey, i've just uploaded a polish translation of MH, can you check it out for errors, cause i'm a total newbie when it comes to programming, cheers.
Merge branch 'release-1.5.0' into develop
Merge branch 'hotfix-1.5.1' into develop
There's actually not any changes in the diff. In order to merge your changes, you need to commit that JSON file (named as _locales/pl/messages.json) in the actual repository in your fork, not just have it as a downloadable file.