fix: use location for language, not extension

Rather than relying on .lang.md this expects to find the English source
challenge in /curriculum/challenges/english/<translationPath>

curriculum/__fixtures__/english/challenge-html-comments.md

@@ -0,0 +1,63 @@
+---
+id: bd7123c8c441eddfaeb5bdef
+title: Say Hello to HTML Elements
+challengeType: 0
+videoUrl: 'https://scrimba.com/p/pVMPUv/cE8Gpt2'
+forumTopicId: 18276
+---
+
+## Description
+<section id='description'>
+
+```js
+  // change code below this line
+```
+
+</section>
+
+## Instructions
+<section id='instructions'>
+To pass the test on this challenge, change your <code>h1</code> element's text to say "Hello World".
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: Your <code>h1</code> element should have the text "Hello World".
+    testString: assert.isTrue((/hello(\s)+world/gi).test($('h1').text()));
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='html-seed'>
+
+```html
+<h1>Hello</h1>
+<!-- Add your code below this line -->
+<!-- Add your code above this line -->
+<style>
+  /* change code below this line */
+  /* change code above this line */
+</style>
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```html
+<h1>Hello World</h1>
+```
+
+</section>