fix hardcoded setfr in main file

doc/profile.conf.example

@@ -89,6 +89,11 @@ TERM=xterm-256color
 # creates setfr, setus, setes.
 #SET_LOCALE=fr:fr_FR.UTF-8,us:en_US.UTF-8
 
+# Alias to activate at login. Must match one of the aliases defined in SET_LOCALE above.
+# Example: DEFAULT_LANG=fr  → calls setfr at startup.
+# Leave unset to keep the system default locale.
+#DEFAULT_LANG=fr
+
 # ==============================================================================
 [net]
 # dwl: Force a specific download tool (curl, wget, fetch).