Adds a helper for issue heading (#7647).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@5447 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/issues/show.rhtml

@@ -1,6 +1,6 @@
 <%= render :partial => 'action_menu' %>
 
-<h2><%= @issue.tracker.name %> #<%= @issue.id %></h2>
+<h2><%= issue_heading(@issue) %></h2>
 
 <div class="<%= @issue.css_classes %> details">
         <%= avatar(@issue.author, :size => "50") %>