Add multilingual language and systems learning tracks

ceb/expanded-8-2/lesson-3/main.html

@@ -0,0 +1,5 @@
+<!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>Planner checks</h1><pre id="result"></pre></main>
+<script>function remaining(total,done){return Math.max(0,total-done)}const cases=[[4,1,3],[4,4,0],[4,5,0],[0,0,0]];document.getElementById("result").textContent=cases.map(([t,d,want])=>`${t},${d}: ${remaining(t,d)===want?"PASS":"FAIL"}`).join("\n");</script></html>