Fixed that OK button is not localized

Because the dialog is stored as a static variable, so
the ok button string resource was not refreshed after
language changed.

And in fact there is no need to cache the dialog. We
should always create it when needed, and let it GC'd
when closed.

Test: Manual
Fix: 145309447
Change-Id: Iaccf51e669dbf76ae4c9fcf149cec665f9090c97
1 file changed