fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-7-10001st-prime.md

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+---
+id: 5900f3731000cf542c50fe86
+challengeType: 5
+title: 'Problem 7: 10001st prime'
+forumTopicId: 302182
+---
+
+## Description
+<section id='description'>
+
+By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
+
+What is the `n`th prime number?
+
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>nthPrime(6)</code> should return a number.
+    testString: assert(typeof nthPrime(6) === 'number');
+  - text: <code>nthPrime(6)</code> should return 13.
+    testString: assert.strictEqual(nthPrime(6), 13);
+  - text: <code>nthPrime(10)</code> should return 29.
+    testString: assert.strictEqual(nthPrime(10), 29);
+  - text: <code>nthPrime(100)</code> should return 541.
+    testString: assert.strictEqual(nthPrime(100), 541);
+  - text: <code>nthPrime(1000)</code> should return 7919.
+    testString: assert.strictEqual(nthPrime(1000), 7919);
+  - text: <code>nthPrime(10001)</code> should return 104743.
+    testString: assert.strictEqual(nthPrime(10001), 104743);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function nthPrime(n) {
+
+  return true;
+}
+
+nthPrime(10001);
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+const nthPrime = n => {
+  let pN = 2;
+  let step = 0;
+  while (step < n) {
+    let isPrime = true;
+    let rootN = Math.sqrt(pN);
+    for (let i = 2; i <= rootN; i++) {
+      if (!(pN % i)) {
+        isPrime = false;
+        break;
+      }
+    }
+    isPrime ? step++ : '';
+    pN++;
+  }
+  return pN - 1;
+}
+```
+
+</section>