[web] Fix several raw html flags in twig (#4325)

* [Update, Config] Add subject for watchdog emails

* [Web] Fixed sender_acl_disabled var in twig

* [Web] Fixed add_relayhost_hint var in twig

* [Web] Fixed merged_vars_hint var in twig

Co-authored-by: Valentin <vbrandner.itsb-b2018@fh-salzburg.ac.at>
Co-authored-by: Valentin <git@voidl.de>

data/web/templates/admin/tab-config-customize.twig

@@ -29,7 +29,7 @@
         </div>
       {% endif %}
       <legend>{{ lang.admin.app_links }}</legend>
-      <p class="help-block">{{ lang.admin.merged_vars_hint }}</p>
+      <p class="help-block">{{ lang.admin.merged_vars_hint|raw }}</p>
       <form class="form-inline" data-id="app_links" role="form" method="post">
         <table class="table table-condensed" style="white-space: nowrap;" id="app_link_table">
           <tr>

data/web/templates/admin/tab-routing.twig

@@ -20,7 +20,7 @@
         </div>
       </div>
       <legend>{{ lang.admin.add_relayhost }}</legend>
-      <p class="help-block">{{ lang.admin.add_relayhost_hint }}</p>
+      <p class="help-block">{{ lang.admin.add_relayhost_hint|raw }}</p>
       <div class="row">
         <div class="col-md-8">
           <form class="form" data-id="rlyhost" role="form" method="post">

data/web/templates/edit/mailbox.twig

@@ -65,7 +65,7 @@
               <option>{{ address }}</option>
             {% endfor %}
           </select>
-          <div id="sender_acl_disabled"><i class="bi bi-shield-exclamation"></i> {{ lang.edit.sender_acl_disabled }}</div>
+          <div id="sender_acl_disabled"><i class="bi bi-shield-exclamation"></i> {{ lang.edit.sender_acl_disabled|raw }}</div>
           <small class="help-block">{{ lang.edit.sender_acl_info|raw }}</small>
         </div>
       </div>