Add multilingual language and systems learning tracks

ceb/expanded-8-1/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>Study counter</h1><button id="add">Complete one</button><p id="count" aria-live="polite">0</p></main>
+<script>let done=0;document.getElementById("add").addEventListener("click",()=>{done+=1;document.getElementById("count").textContent=String(done);});</script></html>