Add multilingual language and systems learning tracks

en/expanded-24-2/lesson-1/main.py

@@ -0,0 +1,5 @@
+import hashlib
+original=b"study record v1"
+restored=bytes(original)
+assert hashlib.sha256(original).digest()==hashlib.sha256(restored).digest()
+print("Bytes match; application checks still needed")