Update 'next-3.x' with latest changes from 'main'

ajax/template/LangList.html

 {strip}
 <ul class="lcs-menu-list">
     {foreach from=$langs item=lang}
-    <li class="lcs-menu-list-entry">
-        {if $Site->getId($lang)}
+    <li class="lcs-menu-list-entry" style="color: #333">
+        {if $Site->existLang($lang)}
         <a class="lcs-menu-list-entry-link {if $projectLang === $lang}current-lang{/if}" href="{url id=$Site->getId($lang) lang=$lang}">
         {else}
         <a class="lcs-menu-list-entry-link" href="{url id=1 lang=$lang}">
@@ -12,7 +12,7 @@
                 <img src="{$path}{$lang}.png"/>
             </span>
             <span class="lcs-menu-list-entry-link-text ">
-                {locale group="quiqqer/system" var="language.$lang"}
+                {locale group="quiqqer/quiqqer" var="language.$lang"}
             </span>
 
         </a>