add a duplicate action to crud

changes as suggested
Fix spacing in en.yml

Author: anitagraham

core/lib/refinery/crud.rb

@@ -85,9 +85,8 @@ def edit
           end
           
           def duplicate
-            original = @#{singular_name}
-            @#{singular_name} = original.dup
-            @#{singular_name}.title += ' Copy'
+            @#{singular_name} = @#{singular_name}.dup
+            @#{singular_name}.title << ' Copy'
             render 'edit'
           end