v2.12.3

Fixes

• I18n.t requires keyword arguments (#285) by @jgraichen

Looking for testers!

Unfortunately, I do not have access to any larger Redmine project anymore, nor am I using Redmine anywhere anymore. I can only test with some artificially constructed local project that cannot represent any real project or usage. I would really appreciate if you can test v2.12.3 in your project or organization and report any findings (or their absence). Thank you!