fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-371-licence-plates.md

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+---
+id: 5900f4e01000cf542c50fff2
+challengeType: 5
+title: 'Problem 371: Licence plates'
+forumTopicId: 302033
+---
+
+## Description
+<section id='description'>
+Oregon licence plates consist of three letters followed by a three digit number (each digit can be from [0..9]).
+While driving to work Seth plays the following game:
+Whenever the numbers of two licence plates seen on his trip add to 1000 that's a win.
+
+
+E.g. MIC-012 and HAN-988 is a win and RYU-500 and SET-500 too. (as long as he sees them in the same trip).
+
+
+Find the expected number of plates he needs to see for a win.
+Give your answer rounded to 8 decimal places behind the decimal point.
+
+
+Note: We assume that each licence plate seen is equally likely to have any three digit number on it.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>euler371()</code> should return 40.66368097.
+    testString: assert.strictEqual(euler371(), 40.66368097);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler371() {
+
+  return true;
+}
+
+euler371();
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+</section>