* 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
