fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-310-nim-square.md

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+---
+id: 5900f4a21000cf542c50ffb5
+challengeType: 5
+title: 'Problem 310: Nim Square'
+forumTopicId: 301966
+---
+
+## Description
+<section id='description'>
+Alice and Bob play the game Nim Square.
+Nim Square is just like ordinary three-heap normal play Nim, but the players may only remove a square number of stones from a heap.
+The number of stones in the three heaps is represented by the ordered triple (a,b,c).
+If 0≤a≤b≤c≤29 then the number of losing positions for the next player is 1160.
+
+
+Find the number of losing positions for the next player if 0≤a≤b≤c≤100 000.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>euler310()</code> should return 2586528661783.
+    testString: assert.strictEqual(euler310(), 2586528661783);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function euler310() {
+
+  return true;
+}
+
+euler310();
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+</section>