re #174.
re #174.

The problem happened when you wanted to edit a sentence with unknown language. The sentence id was set as _123 (with the underscore) instead of 123. So CakePHP would consider it as non valid id, and therefore would save as a new sentence instead of updating.

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