Please try el_GR.utf8 too. Technically you don't have el_GR.UTF-8 (local -a output). This shouldn't matter but maybe this legacy support was broken by a developer accidentally.
Please try el_GR.utf8 too. Technically you don't have el_GR.UTF-8 (local -a output). This shouldn't matter but maybe this legacy support was broken by a developer accidentally.