pdf: add a new feature to export wiki pdf (#401)

Contributed by Jun NAITOH.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7741 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/wiki/show.html.erb

@@ -53,6 +53,7 @@
 <% end %>
 
 <% other_formats_links do |f| %>
+  <%= f.link_to 'PDF', :url => {:id => @page.title, :version => @content.version} %>
   <%= f.link_to 'HTML', :url => {:id => @page.title, :version => @content.version} %>
   <%= f.link_to 'TXT', :url => {:id => @page.title, :version => @content.version} %>
 <% end if User.current.allowed_to?(:export_wiki_pages, @project) %>