Use new random selection method when $lang = 'und'
Use new random selection method when $lang = 'und'

Minor fix for 8cbfcd600ffba27ba09285f5db4d43dd9642c955.

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