fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-77-prime-summations.md

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+---
+id: 5900f3b91000cf542c50fecc
+challengeType: 5
+title: 'Problem 77: Prime summations'
+forumTopicId: 302190
+---
+
+## Description
+<section id='description'>
+
+It is possible to write ten as the sum of primes in exactly five different ways:
+
+<div style='margin-left: 4em;'>
+  7 + 3<br>
+  5 + 5<br>
+  5 + 3 + 2<br>
+  3 + 3 + 2 + 2<br>
+  2 + 2 + 2 + 2 + 2<br>
+</div>
+
+What is the first value which can be written as the sum of primes in over five thousand different ways?
+
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>primeSummations()</code> should return a number.
+    testString: assert(typeof primeSummations() === 'number');
+  - text: <code>primeSummations()</code> should return 71.
+    testString: assert.strictEqual(primeSummations(), 71);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function primeSummations() {
+
+  return true;
+}
+
+primeSummations();
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+</section>