changes to the style of the mahnungs zurücksetzungs Modal

Web/templates/mahnungen_admin.html

@@ -214,7 +214,7 @@
 
 <!-- E-Mail Modal -->
 <div class="modal fade" id="emailModal" tabindex="-1" aria-labelledby="emailModalLabel" aria-hidden="true">
-    <div class="modal-dialog">
+    <div class="modal-dialog modal-dialog-centered">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="emailModalLabel">Mahnungs-E-Mail senden</h5>
@@ -247,7 +247,7 @@
 
 <!-- Custom Reset Days Modal -->
 <div class="modal fade" id="customResetModal" tabindex="-1" aria-labelledby="customResetModalLabel" aria-hidden="true">
-    <div class="modal-dialog">
+    <div class="modal-dialog modal-dialog-centered">
         <div class="modal-content">
             <div class="modal-header">
                 <h5 class="modal-title" id="customResetModalLabel">Mahnung zurücksetzen</h5>