Add multilingual language and systems learning tracks

tl/expanded-8-2/lesson-2/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>Tasks</h1><ul id="tasks"></ul></main>
+<script>const tasks=["Read","Test","<strong>Explain</strong>"];for(const text of tasks){const li=document.createElement("li");li.textContent=text;document.getElementById("tasks").append(li);}</script></html>