fix: fallback to english challenges (#45635)

* fix: fallback to english challenges

All challenges will use the english version if a translated file is not
available.  SHOW_NEW_CURRICULUM still gates what's shown in the client.

* refactor: use closures to simplify createChallenge

* refactor: remove messy destructure

* refactor: add meta via helper

* fix: fallback to [] for meta.required

* fix: repair challenge.block

* refactor: use CONST_CASE for meta + challenge dirs

* fix: catch empty superblocks immediately

* fix: clean up path.resolves

* fix: invalid syntax in JS project steps

* fix: default to english comments and relax tests

Instead of always throwing errors when a comment is not translated, the
tests now warn while SHOW_UPCOMING_CHANGES is true, so that tests will
pass while we're developing and allow translators time to work.

They still throw when SHOW_UPCOMING_CHANGES is false to catch issues
in production

* test: update createCommentMap test

* refactor: delete stale comment

* refactor: clarify validate with explanatory consts

* feat: throw if audited cert falls back to english

* fix: stop testing upcoming localized curriculum

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript-rpg-game/step-129.md

@@ -199,7 +199,7 @@ const locations = [
     "button text": ["REPLAY?", "REPLAY?", "REPLAY?"],
     "button functions": [restart, restart, restart],
     text: "You die. ☠️"
-  }
+  },
   { 
     name: "win", 
     "button text": ["Fight slime", "Fight fanged beast", "Go to town square"], 

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming-spreadsheet/step-063.md

@@ -111,7 +111,7 @@ const charRange = (start, end) =>
 const evalFormula = x => {
   const rangeRegex = /([A-J])([1-9][0-9]?):([A-J])([1-9][0-9]?)/gi;
   const rangeFromString = (n1, n2) => range(parseInt(n1), parseInt(n2));
-  const elemValue = n => (c => document.getElementById(c + n).value));
+  const elemValue = n => c => document.getElementById(c + n).value;
   const fn = elemValue("1");
   return fn("A");
 };

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/functional-programming-spreadsheet/step-122.md

@@ -90,7 +90,7 @@ const spreadsheetFunctions = {
   lasttwo: arr => arr.slice(-2),
   even: nums => nums.filter(isEven),
   sum: nums => nums.reduce((a, x) => a + x),
-  has2: arr => arr.includes(2)
+  has2: arr => arr.includes(2),
   nodups: arr => arr.reduce((a, x) => a.includes(x), [])
 };