Default configuration data can now be loaded from the administration screen.

A message is automatically displayed on this screen if roles, trackers,... have not been configured yet.
The rake task is still available and the data loading code is wrapped in a transaction.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1040 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/admin/_no_data.rhtml

@@ -0,0 +1,8 @@
+<div class="nodata">
+<% form_tag({:action => 'default_configuration'}) do %>
+    <%= simple_format(l(:text_no_configuration_data)) %>
+    <p><%= l(:field_language) %>:
+    <%= select_tag 'lang', options_for_select(lang_options_for_select(false), current_language.to_s) %>
+    <%= submit_tag l(:text_load_default_configuration) %></p>
+<% end %>
+</div>