Merge branch 'small-ui-improvements' into 'master'

Small ui improvements

* fix ugly errors block when admin save invalid user
* fix ugly errors when you tries to save invalid wiki page

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

@@ -2,9 +2,9 @@
   = form_for [:admin, @user], html: { class: 'form-horizontal' } do |f|
     -if @user.errors.any?
       #error_explanation
-        %ul.unstyled.alert.alert-danger
+        .alert.alert-danger
           - @user.errors.full_messages.each do |msg|
-            %li= msg
+            %p= msg
 
     %fieldset
       %legend Account

app/views/projects/wikis/_form.html.haml

 = form_for [@project, @page], method: @page.persisted? ? :put : :post, html: { class: 'form-horizontal' } do |f|
   -if @page.errors.any?
     #error_explanation
-      %h2= "#{pluralize(@page.errors.count, "error")} prohibited this wiki from being saved:"
-      %ul
+      .alert.alert-danger
         - @page.errors.full_messages.each do |msg|
-          %li= msg
+          %p= msg
 
   = f.hidden_field :title, value: @page.title
   .form-group