limit the new aspect form name to be less than 20 char in the form

app/views/aspects/_new_aspect.haml

@@ -10,6 +10,6 @@
     = aspect.error_messages
     %p
       = aspect.label :name , t('.name')
-      = aspect.text_field :name
+      = aspect.text_field :name, :maxlength => 20
     = aspect.submit t('.create'), :class => 'button'