Addresses several structure and style issues with TOTP and Email dialogs.

Added missing div tags that were causing style problems.
Reformatted HTML to make it easier to read.
Added whitespace above buttons on TOTP Add dialog.
Changed "6-digit" to "code" on email dialogs because number of digits varies.

mfa/templates/MFA.html

@@ -66,7 +66,7 @@
                 {% endif %}
             </ul>
             </div>
-
+        </div>
     <br/>
     <br/>
        <table class="table table-striped">