Fix #4571: Show banner when email verification is required.

* Show a banner if the user is restricted because they signed up from a
  proxy or VPN.

* Add an option to resend the confirmation email if your account has an
  unverified email address.

app/views/emails/edit.html.erb

@@ -1,14 +1,26 @@
-<% page_title "Change Email" %>
-
 <div id="c-emails">
-  <div id="a-edit">
-    <h1>Change Email</h1>
+  <div id="a-edit" class="fixed-width-container">
+    <% if @user.email_address.present? %>
+      <% page_title "Change Email" %>
+      <h1>Change Email</h1>
 
-    <p>You must confirm your password in order to change your email address.</p>
+      <p>Your current email address is <strong><%= @user.email_address.address %></strong>. You must re-enter your password in order to update your email address.</p>
+    <% else %>
+      <% page_title "Add Email" %>
+      <h1>Add Email</h1>
+
+      <p>Add a new email address below. You must re-enter your password in order to update your email address.</p>
+    <% end %>
+
+    <% if @user.is_restricted? %>
+      <p>Your account is restricted because you signed up from a VPN or proxy.
+      You can still use the site, but you won't be able to leave comments, edit
+      tags, or upload posts until you add a verified email address to your account.</p>
+    <% end %>
 
     <%= edit_form_for(@user, url: user_email_path(@user)) do |f| %>
+      <%= f.input :email, as: :email, label: "New Email", input_html: { value: "" } %>
       <%= f.input :password %>
-      <%= f.input :email, as: :email, input_html: { value: "" } %>
       <%= f.submit "Save" %>
     <% end %>
   </div>