diff --git a/app/views/course/forum/index/_areas.php b/app/views/course/forum/index/_areas.php
index 11f32be47770e0554ae3a21f7dd07a26c11dd72f..4f4fa0fa34f54d1cdaafff88add97b29b0bad7b0 100644
--- a/app/views/course/forum/index/_areas.php
+++ b/app/views/course/forum/index/_areas.php
@@ -46,17 +46,18 @@
         <col>
         <col>
         <col class="hidden-tiny-down">
-        <col>
+        <col style="width: 20px">
     </colgroup>
 
     <thead>
         <tr>
-            <th colspan="2"> <?= _('Name des Bereichs') ?></th>
+            <th></th>
+            <th> <?= _('Name des Bereichs') ?></th>
             <th data-type="answers"><?= _("Beiträge") ?></th>
             <th data-type="last_posting" class="hidden-tiny-down">
                 <?= _("letzte Antwort") ?>
             </th>
-            <th></th>
+            <th> <?= _('Aktionen') ?> </th>
         </tr>
     </thead>
 
diff --git a/app/views/course/members/accepted_list.php b/app/views/course/members/accepted_list.php
index 7b34ef37f914a27f204f9aad919b0a6cb319bcd3..8bcd5f8e7e1bb6922f9daee5e71961fe875cd349 100644
--- a/app/views/course/members/accepted_list.php
+++ b/app/views/course/members/accepted_list.php
@@ -39,7 +39,7 @@
                            type="checkbox" name="all" value="1" data-proxyfor=":checkbox[name^=accepted]">
                 </th>
             <? endif ?>
-                <th></th>
+                <th><p class="sr-only"><?= _('Nummer') ?></p></th>
                 <th <?if ($sort_by === 'nachname' && $sort_status === 'accepted') printf('class="sort%s"', $order); ?>>
                     <? $order = $sort_status !== 'accepted' ? 'desc' : $order; ?>
                     <a href="<?= URLHelper::getLink(sprintf(
diff --git a/app/views/course/members/autor_list.php b/app/views/course/members/autor_list.php
index 0464d4700af1161fa61245d7ded570d970e4e7a3..e19868f66be72d1870a22b80c35d264ae9738ca1 100644
--- a/app/views/course/members/autor_list.php
+++ b/app/views/course/members/autor_list.php
@@ -48,7 +48,7 @@
                            type="checkbox" name="all" value="1" data-proxyfor=":checkbox[name^=autor]">
                 </th>
             <? endif ?>
-                <th></th>
+                <th><p class="sr-only"><?= _('Nummer') ?></p></th>
                 <th <? if ($sort_by === 'nachname' && $sort_status === 'autor') printf('class="sort%s"', $order); ?>>
                     <? $order = $sort_status !== 'autor' ? 'desc' : $order; ?>
                     <a href="<?= URLHelper::getLink(sprintf(
diff --git a/app/views/course/members/awaiting_list.php b/app/views/course/members/awaiting_list.php
index b8c1e08c605ac250a26f4af3fb00a7faf3e47a7c..86e76b7b755b956bc7581be5223d92e06a78fc64 100644
--- a/app/views/course/members/awaiting_list.php
+++ b/app/views/course/members/awaiting_list.php
@@ -36,7 +36,7 @@
                            data-activates="#action_awaiting,button[name='submit_awaiting']">
                 </th>
             <? endif ?>
-                <th></th>
+                <th><p class="sr-only"><?= _('Nummer') ?></p></th>
                 <th <? if ($sort_by === 'nachname' && $sort_status === $waiting_type) printf('class="sort%s"', $order); ?>>
                     <a href="<?= URLHelper::getLink(sprintf(
                         "?sortby=nachname&sort_status={$waiting_type}&order=%s&toggle=%s#awaiting",
diff --git a/app/views/course/members/dozent_list.php b/app/views/course/members/dozent_list.php
index 9b11d075a7be337ca99871c3c9db8cb3817408dc..a2bae4e5d395dff675a3ca302685c18206b5803f 100644
--- a/app/views/course/members/dozent_list.php
+++ b/app/views/course/members/dozent_list.php
@@ -25,7 +25,7 @@
     </colgroup>
     <thead>
         <tr class="sortable">
-            <th></th>
+            <th><p class="sr-only"><?= _('Nummer') ?></p></th>
             <th <? if ($sort_by === 'nachname' && $sort_status === 'dozent') printf('class="sort%s"', $order); ?>>
                 <? $order = $sort_status !== 'dozent' ? 'desc' : $order; ?>
                 <a href="<?= URLHelper::getLink(sprintf(
diff --git a/app/views/course/members/tutor_list.php b/app/views/course/members/tutor_list.php
index 6af208c698f53bcd39cc9f23c76386553d51e0a1..a8d46c6b5957af9524ae1c6777af7a40c2cd831c 100644
--- a/app/views/course/members/tutor_list.php
+++ b/app/views/course/members/tutor_list.php
@@ -43,7 +43,7 @@
                            type="checkbox" name="all" value="1" data-proxyfor=":checkbox[name^=tutor]">
                 </th>
             <? endif ?>
-                <th></th>
+                <th><p class="sr-only"><?= _('Nummer') ?></p></th>
                 <th <? if ($sort_by === 'nachname' && $sort_status === 'tutor') printf('class="sort%s"', $order); ?>>
                     <? $order = $sort_status !== 'tutor' ? 'desc' : $order; ?>
                     <a href="<?= URLHelper::getLink(sprintf(
diff --git a/app/views/course/members/user_list.php b/app/views/course/members/user_list.php
index 9b2aceabc288ccb1646b9f5dbe0e0e81cee91e50..04da780493a194d2267c338bd27e5cd88cdee343 100644
--- a/app/views/course/members/user_list.php
+++ b/app/views/course/members/user_list.php
@@ -43,7 +43,7 @@
                            type="checkbox" name="all" value="1" data-proxyfor=":checkbox[name^=user]">
                 </th>
             <? endif ?>
-                <th></th>
+                <th><p class="sr-only"><?= _('Nummer') ?></p></th>
                 <th <? if ($sort_by === 'nachname' && $sort_status === 'user') printf('class="sort%s"', $order); ?>>
                     <? $order = $sort_status !== 'user' ? 'desc' : $order; ?>
                     <a href="<?= URLHelper::getLink(sprintf(