Ensure apps and permissions are correctly sorted by the locale.

This modifies PermissionAppsFragment and ManagePermissionsFragment to
sort the list of apps and permissions in a locale-sensitive way using
a Collator.

AppPermissionsFragment was already correct because
AppPermissionGroup's compareTo method uses a Collator, but at Philip's
suggestion I modified the UI element to sort as well to avoid that
hidden dependence.

Test: See alphabetical ordering of apps and permissions in English and
in Spanish for the modified fragments.

Change-Id: Ifaaaad711314f755ce23ed911385f083cae8e2b7