The langage used by commands cannot be set using locales module.

removeads.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 
 import argparse
-import locale
 import re
 from sys import exit
 from datetime import datetime,timedelta,time
@@ -848,8 +847,6 @@ def extractSubTitleTrack(mkvmerge, inputFileName, index, lang):
 def main():
     logger = logging.getLogger(__name__)
     coloredlogs.install()
-    # Fix the language used by tools to print their messages to make the script independant of environment.
-    locale.setlocale(locale.LC_ALL, 'C')
     parser = argparse.ArgumentParser()
     parser.add_argument("-i", "--input", dest='inputFile', type=str, required=True, help="Input file to process (can be .ts, .mp4 or .mkv).")
     parser.add_argument("-o", "--output", dest='outputFile', type=str, required=True, help="Output MKV file to produce.")