updated btn class to "mailing-btn"

Author: XataBq

templates/users/admin/users_change_form.html

@@ -6,7 +6,7 @@
 
     {{ block.super }}
     <div class="submit-row">
-        <input type="button" class="export-btn" value="Рассылка" onclick="mailing()"/>
+        <input type="button" class="mailing-btn" value="Рассылка" onclick="mailing()"/>
     </div>
     <script>
         function mailing() {