Set locale in python save routine

Fixes https://gitlab.com/kicad/code/kicad/issues/11006

(cherry picked from commit c3496d61eb)

pcbnew/python/scripting/pcbnew_scripting_helpers.cpp

@@ -243,6 +243,10 @@ bool SaveBoard( wxString& aFileName, BOARD* aBoard, IO_MGR::PCB_FILE_T aFormat,
     aBoard->BuildConnectivity();
     aBoard->SynchronizeNetsAndNetClasses();
 
+    // Ensure the "C" locale is temporary set, before saving any file
+    // It also avoid wxWidget alerts about locale issues, later, when using Python 3
+    LOCALE_IO dummy;
+
     try
     {
         IO_MGR::Save( aFormat, aFileName, aBoard, nullptr );