Missing "_" (underscore) in user-groups.php

On line 481 in the user-groups.php file there is an underscore missing which is causing a warning to be thrown.

BEFORE

<label for=”user-groups-select” class=”screen-reader-text”><?php _(‘User Group’, ‘user-group’); ?></label>
<select name=”user-group” id=”user-groups-select” style=”max-width: 300px;”>

AFTER (note the double underscore before user group)

<label for=”user-groups-select” class=”screen-reader-text”><?php __(‘User Group’, ‘user-group’); ?></label>
<select name=”user-group” id=”user-groups-select” style=”max-width: 300px;”>

https://www.ads-software.com/plugins/user-groups/