Revert "Use Sphinx phrase search instead of our own quotes"
Revert "Use Sphinx phrase search instead of our own quotes"

This reverts commit 864aecc33b74bc738dfe316d40d522b7227d1333.
Sphinx phrase search mode is deprecated. In addition, it’s not
consistent with the link to search in View/Vocabulary/of.ctp.
We’d better find a way around with quoting instead.

Refs #1405.

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