Update script for update_pofiles

We were missing a few of the folders used for i18n purposes from
the update_pofiles script. Added the following entries:

FlattenerGrid.js
match_set.js
PCrudFilterPane.js
serial.js
tpac
URLVerify.js
vandelay.js

Also, change from Acq.js to acq.js.

Signed-off-by: Ben Shum <bshum@biblio.org>