Consistent style for Github Issues' labels

[quettabit]

What's holding us back, and how?
In Issues, for multi-word labels, I notice an inconsistency in style.
Few of them use hyphen between words like feature-request, ux-research.
Few others use space between words like good first issue, help wanted.

What are some options for remediating it?
If there is a reason behind it, please let us know, and do close this issue.
But If it is due to an inconsistent style, I think we can stick to any one i.e., space or hyphen, and
make all labels consistent in style.