fix: replace .english.md extension with .md

curriculum/challenges/english/10-coding-interview-prep/rosetta-code/last-friday-of-each-month.md

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+---
+id: 5a23c84252665b21eecc7edc
+title: Last Friday of each month
+challengeType: 5
+forumTopicId: 302299
+---
+
+## Description
+
+<section id='description'>
+
+Write a function that returns the date of the last Friday of a given month for a given year.
+
+</section>
+
+## Instructions
+
+<section id='instructions'>
+
+</section>
+
+## Tests
+
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>lastFriday</code> should be a function.
+    testString: assert(typeof lastFriday == 'function');
+  - text: <code>lastFriday(2018, 1)</code> should return a number.
+    testString: assert(typeof lastFriday(2018, 1) == 'number');
+  - text: <code>lastFriday(2018, 1)</code> should return <code>26</code>.
+    testString: assert.equal(lastFriday(2018, 1), 26);
+  - text: <code>lastFriday(2017, 2)</code> should return <code>24</code>.
+    testString: assert.equal(lastFriday(2017, 2), 24);
+  - text: <code>lastFriday(2012, 3)</code> should return <code>30</code>.
+    testString: assert.equal(lastFriday(2012, 3), 30);
+  - text: <code>lastFriday(1900, 4)</code> should return <code>27</code>.
+    testString: assert.equal(lastFriday(1900, 4), 27);
+  - text: <code>lastFriday(2000, 5)</code> should return <code>26</code>.
+    testString: assert.equal(lastFriday(2000, 5), 26);
+  - text: <code>lastFriday(2006, 6)</code> should return <code>30</code>.
+    testString: assert.equal(lastFriday(2006, 6), 30);
+  - text: <code>lastFriday(2010, 7)</code> should return <code>30</code>.
+    testString: assert.equal(lastFriday(2010, 7), 30);
+  - text: <code>lastFriday(2005, 8)</code> should return <code>26</code>.
+    testString: assert.equal(lastFriday(2005, 8), 26);
+```
+
+</section>
+
+## Challenge Seed
+
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function lastFriday(year, month) {
+
+}
+```
+
+</div>
+</section>
+
+## Solution
+
+<section id='solution'>
+
+```js
+function lastFriday(year, month) {
+  var i, last_day;
+  i = 0;
+  while (true) {
+    last_day = new Date(year, month, i);
+    if (last_day.getDay() === 5) {
+      return last_day.getDate();
+    }
+    i -= 1;
+  }
+}
+```
+
+</section>