Remove obsolete trans_id attribute
Remove obsolete trans_id attribute

This reverts b197568dba84771710a7bd5e96d801933ff20bba.

Recent delta index changes to the Sphinx config broke
backward compatibility anyways.

Tatoeba/tatoeba2,Tatoeba/tatoeba2,shashank19gaurav/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,shashank19gaurav/tatoeba2,shashank19gaurav/tatoeba2,shashank19gaurav/tatoeba2,Tatoeba/tatoeba2