Some UI strings can be internationalized, but they are not currently.

Modifications are the following.

role-based-hide-adminbar.php, Line 33

add_options_page(__('Hide Adminbar', 'role-based-hide-adminbar' ), __('Hide Adminbar', 'role-based-hide-adminbar' ), 'manage_options', 'rbhabar-setting', array($this, 'rbhabar_options_page'));

Another thing, please show the user roles’ localized name.

Thanks a lot.