fix: replace .english.md extension with .md

curriculum/challenges/english/01-responsive-web-design/basic-css/use-abbreviated-hex-code.md

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+---
+id: bad87fee1348bd9aedf08719
+title: Use Abbreviated Hex Code
+challengeType: 0
+videoUrl: 'https://scrimba.com/c/cRkpKAm'
+forumTopicId: 18338
+---
+
+## Description
+<section id='description'>
+Many people feel overwhelmed by the possibilities of more than 16 million colors. And it's difficult to remember hex code. Fortunately, you can shorten it.
+For example, red's hex code <code>#FF0000</code> can be shortened to <code>#F00</code>. This shortened form gives one digit for red, one digit for green, and one digit for blue.
+This reduces the total number of possible colors to around 4,000. But browsers will interpret <code>#FF0000</code> and <code>#F00</code> as exactly the same color.
+</section>
+
+## Instructions
+<section id='instructions'>
+Go ahead, try using the abbreviated hex codes to color the correct elements.
+<table class='table table-striped'><tr><th>Color</th><th>Short Hex Code</th></tr><tr><td>Cyan</td><td><code>#0FF</code></td></tr><tr><td>Green</td><td><code>#0F0</code></td></tr><tr><td>Red</td><td><code>#F00</code></td></tr><tr><td>Fuchsia</td><td><code>#F0F</code></td></tr></table>
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: Your <code>h1</code> element with the text <code>I am red!</code> should be given the <code>color</code> red.
+    testString: assert($('.red-text').css('color') === 'rgb(255, 0, 0)');
+  - text: The abbreviated <code>hex code</code> for the color red should be used instead of the hex code <code>#FF0000</code>.
+    testString: assert(code.match(/\.red-text\s*?{\s*?color:\s*?#F00\s*?;\s*?}/gi));
+  - text: Your <code>h1</code> element with the text <code>I am green!</code> should be given the <code>color</code> green.
+    testString: assert($('.green-text').css('color') === 'rgb(0, 255, 0)');
+  - text: The abbreviated <code>hex code</code> for the color green should be used instead of the hex code <code>#00FF00</code>.
+    testString: assert(code.match(/\.green-text\s*?{\s*?color:\s*?#0F0\s*?;\s*?}/gi));
+  - text: Your <code>h1</code> element with the text <code>I am cyan!</code> should be given the <code>color</code> cyan.
+    testString: assert($('.cyan-text').css('color') === 'rgb(0, 255, 255)');
+  - text: The abbreviated <code>hex code</code> for the color cyan should be used instead of the hex code <code>#00FFFF</code>.
+    testString: assert(code.match(/\.cyan-text\s*?{\s*?color:\s*?#0FF\s*?;\s*?}/gi));
+  - text: Your <code>h1</code> element with the text <code>I am fuchsia!</code> should be given the <code>color</code> fuchsia.
+    testString: assert($('.fuchsia-text').css('color') === 'rgb(255, 0, 255)');
+  - text: The abbreviated <code>hex code</code> for the color fuchsia should be used instead of the hex code <code>#FF00FF</code>.
+    testString: assert(code.match(/\.fuchsia-text\s*?{\s*?color:\s*?#F0F\s*?;\s*?}/gi));
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='html-seed'>
+
+```html
+<style>
+  .red-text {
+    color: #000000;
+  }
+  .fuchsia-text {
+    color: #000000;
+  }
+  .cyan-text {
+    color: #000000;
+  }
+  .green-text {
+    color: #000000;
+  }
+</style>
+
+<h1 class="red-text">I am red!</h1>
+
+<h1 class="fuchsia-text">I am fuchsia!</h1>
+
+<h1 class="cyan-text">I am cyan!</h1>
+
+<h1 class="green-text">I am green!</h1>
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```html
+<style>
+  .red-text {
+    color: #F00;
+  }
+  .fuchsia-text {
+    color: #F0F;
+  }
+  .cyan-text {
+    color: #0FF;
+  }
+  .green-text {
+    color: #0F0;
+  }
+</style>
+
+<h1 class="red-text">I am red!</h1>
+
+<h1 class="fuchsia-text">I am fuchsia!</h1>
+
+<h1 class="cyan-text">I am cyan!</h1>
+
+<h1 class="green-text">I am green!</h1>
+```
+
+</section>