Add multilingual language and systems learning tracks

tl/expanded-8-1/lesson-1/main.html

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+<!doctype html>
+<html lang="en"><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
+<title>Agila study</title>
+<main><h1>My study plan</h1><p>I will explain what I build.</p><ul><li>Read</li><li>Test</li></ul></main>
+</html>