Add multilingual language and systems learning tracks

en/expanded-30-4/lesson-2/main.py

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+candidates=[{"name":"CPU demo","correct":True,"ms":8},{"name":"GPU demo","correct":True,"ms":11},{"name":"Broken demo","correct":False,"ms":1}]
+valid=[c for c in candidates if c["correct"]]
+print("Hypothetical winner:",min(valid,key=lambda c:c["ms"])["name"])