Reorganize sections in Admin area settings

- Create new 'Abuse reports' group
- Create new 'Usage statistics' group
- Create new 'Email' group

app/views/admin/application_settings/_form.html.haml

@@ -49,28 +49,6 @@
         = select(:application_setting, :enabled_git_access_protocol, [['Both SSH and HTTP(S)', nil], ['Only SSH', 'ssh'], ['Only HTTP(S)', 'http']], {}, class: 'form-control')
         %span.help-block#clone-protocol-help
           Allow only the selected protocols to be used for Git access.
-    .form-group
-      .col-sm-offset-2.col-sm-10
-        .checkbox
-          = f.label :version_check_enabled do
-            = f.check_box :version_check_enabled
-            Version check enabled
-    .form-group
-      .col-sm-offset-2.col-sm-10
-        .checkbox
-          = f.label :email_author_in_body do
-            = f.check_box :email_author_in_body
-            Include author name in notification email body
-          .help-block
-            Some email servers do not support overriding the email sender name.
-            Enable this option to include the name of the author of the issue,
-            merge request or comment in the email body instead.
-    .form-group
-      = f.label :admin_notification_email, class: 'control-label col-sm-2'
-      .col-sm-10
-        = f.text_field :admin_notification_email, class: 'form-control'
-        .help-block
-          Abuse reports will be sent to this address if it is set. Abuse reports are always available in the admin area.
 
   %fieldset
     %legend Account and Limit Settings
@@ -340,6 +318,15 @@
           Generate API key at
           %a{ href: 'http://www.akismet.com', target: 'blank'} http://www.akismet.com
 
+  %fieldset
+    %legend Abuse reports
+    .form-group
+      = f.label :admin_notification_email, 'Abuse reports notification email', class: 'control-label col-sm-2'
+      .col-sm-10
+        = f.text_field :admin_notification_email, class: 'form-control'
+        .help-block
+          Abuse reports will be sent to this address if it is set. Abuse reports are always available in the admin area.
+
   %fieldset
     %legend Error Reporting and Logging
     %p
@@ -407,6 +394,29 @@
           = succeed "." do
             = link_to "Koding administration documentation", help_page_path("administration/integration/koding")
 
+  %fieldset
+    %legend Usage statistics
+    .form-group
+      .col-sm-offset-2.col-sm-10
+        .checkbox
+          = f.label :version_check_enabled do
+            = f.check_box :version_check_enabled
+            Version check enabled
+          .help-block
+            Let GitLab inform you when an update is available.
+
+  %fieldset
+    %legend Email
+    .form-group
+      .col-sm-offset-2.col-sm-10
+        .checkbox
+          = f.label :email_author_in_body do
+            = f.check_box :email_author_in_body
+            Include author name in notification email body
+          .help-block
+            Some email servers do not support overriding the email sender name.
+            Enable this option to include the name of the author of the issue,
+            merge request or comment in the email body instead.
 
   .form-actions
     = f.submit 'Save', class: 'btn btn-save'