--- prog~	2025-08-05 19:34:49.000000000 +0200
+++ prog	2025-11-22 19:55:34.167115579 +0100
@@ -75,7 +75,7 @@
 
 LC_NUMERIC
 decimal_point   "."
-thousands_sep   ","
+thousands_sep   "_"
 grouping        3
 END LC_NUMERIC