Change Update Comment button text on comment.php?action=editcomment

[jane]

In translation the button is really long, and there's no real need to include the word Comment, given the context of the screen. Change the Status box primary button text from "Update Comment" to "Update" to address this. Will also be more consistent with posts and pages.

[azaozz]

In [19176]:

Update Comment -> Update, props ocean90, fixes #19166