feat: Child site ID in class

src/QUI/Menu/MegaMenu.html

@@ -20,7 +20,9 @@
             {/if}
         <li class="quiqqer-menu-megaMenu-list-item{if $isInPath} quiqqer-menu-megaMenu-list-item--current{/if}">
             {assign var=subchildren value=$Child->getNavigation()}
-            <a href="{url site=$Child}" title="{$Child->getAttribute('title')|escape:"html"}">
+            <a href="{url site=$Child}"
+               class="qui-menu-siteid-{$Child->getId()}"
+               title="{$Child->getAttribute('title')|escape:"html"}">
                 {$Child->getAttribute('title')}
 
                 {if count($subchildren)}<span class="fa fa-angle-down"></span>{/if}