Restore History link at the top of a wiki page (#26575).

git-svn-id: http://svn.redmine.org/redmine/trunk@17660 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/wiki/show.html.erb

@@ -14,6 +14,7 @@
   <%= link_to_if_authorized(l(:button_rollback), {:action => 'edit', :id => @page.title, :version => @content.version }, :class => 'icon icon-cancel') %>
 <% end %>
 <% end %>
+<%= link_to_if_authorized(l(:label_history), {:action => 'history', :id => @page.title}, :class => 'icon icon-history') %>
 </div>
 
 <%= wiki_page_breadcrumb(@page) %>