Adds a Cancel button on issue edit view (#18051).

Patch by Marcin Świątkiewicz.

git-svn-id: http://svn.redmine.org/redmine/trunk@13477 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/issues/_edit.html.erb

@@ -46,6 +46,7 @@
     <%= hidden_field_tag 'last_journal_id', params[:last_journal_id] || @issue.last_journal_id %>
     <%= submit_tag l(:button_submit) %>
     <%= preview_link preview_edit_issue_path(:project_id => @project, :id => @issue), 'issue-form' %>
+    | <%= link_to l(:button_cancel), {}, :onclick => "$('#update').hide(); return false;" %>
 <% end %>
 
 <div id="preview" class="wiki"></div>