A funny thing happened since I switched from High Sierra. In Terminal commands like date +%A and date +%B give output in Swedish (”Måndag” and ”Mars”, respectively), but Geektool outputs ”Monday” and ”March” in English. Same thing happens to ncal. The calendar just below (25 mars 2019) runs through icalBuddy and shows Swedish dates. Geektool 3.3.1 with ”Set locale environment” checked. The date and time control panel is set to Swedish, and the system’s locale is LANG="sv_SE.UTF-8".