Add multilingual language and systems learning tracks

en/expanded-30-4/lesson-1/main.py

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+import time,statistics,platform
+data=list(range(100000))
+expected=4999950000
+assert sum(data)==expected
+samples=[]
+for _ in range(7):
+    start=time.perf_counter_ns()
+    result=sum(data)
+    samples.append((time.perf_counter_ns()-start)/1e6)
+    assert result==expected
+print("CPU Python",platform.python_version(),platform.machine())
+print("median_ms",round(statistics.median(samples),4))
+print("min_ms",round(min(samples),4),"max_ms",round(max(samples),4))