AdminUX Patch and Admin Page (#2593)

* AdminPage

* More fixes

* Settings Modal Drop

* Translation and docblock

* settingS

* Convert Fieldset to JSX

* info -> headerInfo, className

* Overflow fixes

* MailPage

* Admin Less

* Basics Page

* Changes

* Cleanup

* Permission Page

* Add padding

less/admin/MailPage.less

@@ -1,4 +1,5 @@
 .MailPage {
+  padding-bottom: 30px;
 
   @media @desktop-up {
     .container {
@@ -7,11 +8,11 @@
     }
   }
 
-  fieldset, .Alert {
+  button, .Alert {
     margin-bottom: 20px;
   }
 
-  fieldset > ul {
+  ul {
     list-style: none;
     margin: 0;
     padding: 0;