JIRA is the program that allows Moodle HQ to manage Moodle Tracker which is where all problems with Moodle are tracked as well as suggestions for improvements.
Voting for a particular BUG fix or Improvement is important as this can be a deciding factor to if the issue is integrated into Moodle. So the more votes the better.
There are lots of things that are trivial, so those get lost in the rush to fix other more important issues.
Clean theme is, hopefully, going to become the new 'Standard' theme for Moodle if we can get it ready for when Moodle 2.7 is released next year.
So the sooner bugs like this one are fixed the better the theme will be.
Thanks for your vote.