aapt: localizations: be more aggressive

* errors instead of warnings for:
  * A localized string for which no default-locale version exist.
  * A localized translation of an translateable="false" string.

Change-Id: Ib700fe323019f285f5a1931fe96500b2de03106b
aapt: add check for untranslatable "string-array"s

Change-Id: Id884af0505c0bcdfa20b400fcdd54f699f8ef38f
Signed-off-by: Chirayu Desai <cdesai@cyanogenmod.org>