Add setlocale to set English locale to en_US.UTF-8

src/kalente/__main__.py

@@ -5,6 +5,7 @@ from argparse import ArgumentParser
 from datetime import date, timedelta
 from pathlib import Path
 from typing import Optional
+from locale import setlocale, LC_ALL
 
 from jinja2 import Environment, FileSystemLoader
 from dateutil.parser import parse
@@ -148,6 +149,9 @@ def main():
 
     args = parser.parse_args()
 
+    # Set locale to en_US.UTF-8 – for now, only English is supported
+    setlocale(LC_ALL, "en_US.UTF-8")
+
     if args.country:
         country_code = args.country.upper()
         assert (