improved search engine

* it's now possible to search for multiple words ("all words" or "one of the words" options)
* added a fixed limit for result count

git-svn-id: http://redmine.rubyforge.org/svn/trunk@321 e93f8b46-1217-0410-a6f0-8f06a7374b81

lang/es.yml

@@ -321,6 +321,7 @@ label_roadmap: Roadmap
 label_search: Búsqueda
 label_result: %d resultado
 label_result_plural: %d resultados
+label_all_words: Todas las palabras
 
 button_login: Conexión
 button_submit: Someter