abstraction: add support for uucore locale

The base abstraction allows reading /usr/share//locale/, but uucore coreutils, that replaces gnu coreutils (notably on Resolute) uses /usr/share/coreutils/locales/uucore/*.ftl, and therefore trigger denials.

Fix by changing locale to locale{,s} in the regex to allow this access.

Signed-off-by: Maxime Bélair maxime.belair@canonical.com