diff --git a/data/web/admin.php b/data/web/admin.php
index 20dc6faa..a4d7b697 100644
--- a/data/web/admin.php
+++ b/data/web/admin.php
@@ -10,7 +10,7 @@ $tfa_data = get_tfa();
   <ul class="nav nav-tabs" role="tablist">
     <li role="presentation" class="active"><a href="#tab-access" aria-controls="tab-access" role="tab" data-toggle="tab"><?=$lang['admin']['access'];?></a></li>
     <li role="presentation"><a href="#tab-config" aria-controls="tab-config" role="tab" data-toggle="tab"><?=$lang['admin']['configuration'];?></a></li>
-    <li role="presentation"><a href="#tab-sys-mails" aria-controls="tab-sys-mails" role="tab" data-toggle="tab">System mails</a></li>
+    <li role="presentation"><a href="#tab-sys-mails" aria-controls="tab-sys-mails" role="tab" data-toggle="tab"><?=$lang['admin']['sys_mails'];?></a></li>
   </ul>
 
   <div class="tab-content" style="padding-top:20px">
@@ -849,7 +849,7 @@ $tfa_data = get_tfa();
           </div>
           <div class="form-group">
             <div class="col-sm-offset-2 col-sm-10">
-              <button class="btn btn-default" type="submit" id="mass_send" name="mass_send" disabled><span class="glyphicon glyphicon-envelope"></span> Send</button>
+              <button class="btn btn-default" type="submit" id="mass_send" name="mass_send" disabled><span class="glyphicon glyphicon-envelope"></span> <?=$lang['admin']['send'];?></button>
             </div>
           </div>
         </form>
diff --git a/data/web/inc/functions.inc.php b/data/web/inc/functions.inc.php
index bf265062..4cc43ee3 100644
--- a/data/web/inc/functions.inc.php
+++ b/data/web/inc/functions.inc.php
@@ -47,7 +47,7 @@ function sys_mail($_data) {
 		$_SESSION['return'][] =  array(
 			'type' => 'danger',
       'log' => array(__FUNCTION__),
-			'msg' => 'From address must be a valid email address'
+			'msg' => 'from_invalid'
 		);
 		return false;
   }
@@ -55,7 +55,7 @@ function sys_mail($_data) {
 		$_SESSION['return'][] =  array(
 			'type' => 'danger',
       'log' => array(__FUNCTION__),
-			'msg' => 'Subject must not be empty'
+			'msg' => 'subject_empty'
 		);
 		return false;
   }
@@ -63,7 +63,7 @@ function sys_mail($_data) {
 		$_SESSION['return'][] =  array(
 			'type' => 'danger',
       'log' => array(__FUNCTION__),
-			'msg' => 'Text must not be empty'
+			'msg' => 'text_empty'
 		);
 		return false;
   }
diff --git a/data/web/lang/lang.de.php b/data/web/lang/lang.de.php
index a59ad75c..a4a57c14 100644
--- a/data/web/lang/lang.de.php
+++ b/data/web/lang/lang.de.php
@@ -690,14 +690,18 @@ $lang['success']['tls_policy_map_entry_deleted'] = 'TLS-Richtlinie mit der ID %s
 $lang['mailbox']['add_tls_policy_map'] = "TLS-Richtlinieneintrag hinzufügen";
 $lang['danger']['tls_policy_map_parameter_invalid'] = "Parameter ist ungültig";
 
-$lang['admin']['sys_mails'] = 'System mails';
-$lang['admin']['subject'] = 'Subject';
-$lang['admin']['from'] = 'From';
-$lang['admin']['include_exclude'] = 'Include/Exclude';
-$lang['admin']['include_exclude_info'] = 'By default - with no selection - <b>all mailboxes</b> are addressed';
-$lang['admin']['excludes'] = 'Excludes these recipients';
-$lang['admin']['includes'] = 'Include these recipients';
+$lang['admin']['sys_mails'] = 'System E-Mails';
+$lang['admin']['subject'] = 'Betreff';
+$lang['admin']['from'] = 'Absender';
+$lang['admin']['include_exclude'] = 'Ein- und Ausschlüsse';
+$lang['admin']['include_exclude_info'] = 'Ohne Auswahl werden alle Mailboxen adressiert.';
+$lang['admin']['excludes'] = 'Diese Empfänger ausschließen';
+$lang['admin']['includes'] = 'Diese Empfänger einschließen';
 $lang['admin']['text'] = 'Text';
-$lang['admin']['activate_send'] = 'Activate send button';
+$lang['admin']['activate_send'] = 'Senden-Button freischalten';
+$lang['admin']['send'] = 'Senden';
 
 $lang['warning']['ip_invalid'] = 'Ungültige IP übersprungen: %s';
+$lang['danger']['text_empty'] = 'Text darf nicht leer sein';
+$lang['danger']['subject_empty'] = 'Betreff darf nicht leer sein';
+$lang['danger']['from_invalid'] = 'From address must be a valid email address';
diff --git a/data/web/lang/lang.en.php b/data/web/lang/lang.en.php
index f3e7cba0..90d588ac 100644
--- a/data/web/lang/lang.en.php
+++ b/data/web/lang/lang.en.php
@@ -723,5 +723,9 @@ $lang['admin']['excludes'] = 'Excludes these recipients';
 $lang['admin']['includes'] = 'Include these recipients';
 $lang['admin']['text'] = 'Text';
 $lang['admin']['activate_send'] = 'Activate send button';
+$lang['admin']['send'] = 'Send';
 
 $lang['warning']['ip_invalid'] = 'Skipped invalid IP: %s';
+$lang['danger']['text_empty'] = 'Text must not be empty';
+$lang['danger']['subject_empty'] = 'Subject must not be empty';
+$lang['danger']['from_invalid'] = 'Absender darf nicht leer sein';