Apertium now it's working.
Apertium does not support all language pairs. In addition, Apertium is a translator to assist Microsoft and Google, it can not be used alone to effectively translate pages. Apertum access often depends on the traffic on the server.
Apertium access does not require a key. However, registered users have a higher limit queries.
I got the same message as your first and Apertium works.