Allow adding languages to the database without a list
Allow adding languages to the database without a list

The comment in the script file for the procedure says that it is
possible to add a language without specifying a list. But the
implementation didn't allow that.

Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2