Makes the wiki sidebar editable (#5208).

The content of the wiki page named 'Sidebar' is rendered in the sidebar if it exists. Permission to edit protected pages is required to create this page.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3632 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/wiki/_sidebar.rhtml

@@ -1,3 +1,7 @@
+<% if @wiki && @wiki.sidebar -%>
+  <%= textilizable @wiki.sidebar.content, :text %>
+<% end -%>
+
 <h3><%= l(:label_wiki) %></h3>
 
 <%= link_to l(:field_start_page), {:action => 'index', :page => nil} %><br />