Exclude orphans/unapproved from random sentences
Exclude orphans/unapproved from random sentences

An attempt to make the home page look less bad to newcomers.

This both affects the random sentence of the home page
and the /sentences/several_random_sentences page.

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