languages: create new script update_po.py

The script should do the same work as when one run update_po.sh
The Python script can be run on Windows too.

lang/update-po.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+"""
+Portable script to update po files on most platforms
+Make sure the .pot file is up-to-date first by
+by calling within the ./po folder:
+python ../lang-extract.py --no-missing -s -o Firmware.pot ../../Firmware/[a-zA-Z]*.[ch]* ../../Firmware/mmu2/[a-zA-Z]*.[ch]*
+"""
+
+import sys
+from pathlib import Path
+import polib
+from polib import POFile
+
+BASE_DIR: Path = Path.cwd()
+PO_DIR: Path = BASE_DIR / "po"
+PO_FILE_LIST: list[Path] = []
+POT_REFERENCE: POFile = polib.pofile(PO_DIR/'Firmware.pot')
+
+
+def main():
+    PO_FILE_LIST = sorted(PO_DIR.glob('**/*.po'))
+
+    for po_file in PO_FILE_LIST:
+        po = polib.pofile(po_file)
+        po.merge(POT_REFERENCE)
+        po.save(po_file)
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        sys.exit(-1)