Error strip_tags in menu.inc

Problem/Motivation

After upgrade to civictheme 1.12.1 the site crashed with the message "The website encountered an unexpected error. Try again later.", in recent log message appear this message: "TypeError: strip_tags(): Argument #1 ($string) must be of type string, Drupal\Core\StringTranslation\TranslatableMarkup given in strip_tags() (line 30 of /dati/neuronet/web/themes/contrib/civictheme/includes/menu.inc)"

Steps to reproduce

update CivicTheme to 1.12.1 open any page

Proposed resolution

revert the code web/themes/contrib/civictheme/includes/menu.inc
1) restore line 11:
use Drupal\Component\Utility\Xss;
2) restore line 30:

//    $item['title'] = isset($item['title']) ? strip_tags($item['title']) : '';
      $item['title'] = isset($item['title']) ? Xss::filter($item['title']) : '';

the stip_tags cause the error.

Remaining tasks

User interface changes

API changes

Data model changes