If min_length and max_length are the same in a text input, give the error better wording.

[IllagerCaptain]

Currently, if min_length and max_length are the same, it displays the error "Must be between X and X in length.", which is good for when min_length and max_length are different, but when they are the same, it is badly worded. A better way to display this would be "Must be X in length." or "Must be X characters in length.".