fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/averages-mode.md

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+---
+title: Averages/Mode
+id: 594d8d0ab97724821379b1e6
+challengeType: 5
+forumTopicId: 302226
+---
+
+## Description
+<section id='description'>
+Write a program to find the <a href='https://en.wikipedia.org/wiki/Mode (statistics)' title='wp: Mode (statistics)' target='_blank'>mode</a> value of a collection.
+The case where the collection is empty may be ignored. Care must be taken to handle the case where the mode is non-unique.
+If it is not appropriate or possible to support a general collection, use a vector (array), if possible. If it is not appropriate or possible to support an unspecified value type, use integers.
+</section>
+
+## Instructions
+<section id='instructions'>
+
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>mode</code> should be a function.
+    testString: assert(typeof mode === 'function');
+  - text: <code>mode([1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17])</code> should equal <code>[6]</code>
+    testString: assert.deepEqual(mode(arr1), [6]);
+  - text: <code>mode([1, 2, 4, 4, 1])</code> should equal <code>[1, 4]</code>.
+    testString: assert.deepEqual(mode(arr2).sort(), [1, 4]);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function mode(arr) {
+
+  return true;
+}
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+const arr1 = [1, 3, 6, 6, 6, 6, 7, 7, 12, 12, 17];
+const arr2 = [1, 2, 4, 4, 1];
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```js
+function mode(arr) {
+  const counter = {};
+  let result = [];
+  let max = 0;
+  // for (const i in arr) {
+  arr.forEach(el => {
+    if (!(el in counter)) {
+      counter[el] = 0;
+    }
+    counter[el]++;
+
+    if (counter[el] === max) {
+      result.push(el);
+    }
+    else if (counter[el] > max) {
+      max = counter[el];
+      result = [el];
+    }
+  });
+  return result;
+}
+
+```
+
+</section>