Allows admin to add strings to ThemeStrings.*.php, not Themes.*.php
Allows admin to add strings to ThemeStrings.*.php, not Themes.*.php

Signed-off-by: Jon Stovell <5fe09b7d9f00fd95250ae2a73993b352b084988d@gmail.com>

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery