IBX-9285: Navigation anchor on content creation/edition not working with diacritical marks (#1410)

Author: OstafinL

src/bundle/Resources/views/themes/admin/ui/menu/anchor_menu.html.twig

@@ -49,7 +49,7 @@
         {%- if loop.first %}
             {%- set itemClass = itemClass ~ ' ibexa-anchor-navigation-menu__sections-item-btn--active' %}
         {%- endif %}
-        {%- do item.setAttribute('data-target-id', "#" ~ item.getAttribute('data-target-id')) -%}
+        {%- do item.setAttribute('data-target-id', "#" ~ item.getAttribute('data-target-id')|lower|slug) -%}
         {%- do item.setAttribute('class', (item.getAttribute('class') ~ ' ' ~ itemClass)|trim) -%}
         {%- do item.setAttribute('type', 'button') -%}
         {%- do item.setLabelAttribute('class', 'ibexa-anchor-navigation-menu__sections-item-btn-label') -%}