Change title helper (back) to interpolation

Author: mhartl

app/helpers/application_helper.rb

@@ -6,7 +6,7 @@ def full_title(page_title = '')
     if page_title.empty?
       base_title
     else
-      page_title + " | " + base_title
+      "#{page_title} | #{base_title}"
     end
   end
 end