fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/rosetta-code/factorial.md

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+---
+title: Factorial
+id: 597b2b2a2702b44414742771
+challengeType: 5
+videoUrl: ''
+localeTitle: 阶乘
+---
+
+## Description
+<section id="description"><p>编写一个函数来返回一个数字的阶乘。 </p><p>一个数字的因子由下式给出： </p> N！ = n *（n-1）*（n-2）* ..... * 1 <p>例如：3！ = 3 * 2 * 1 = 6 4！ = 4 * 3 * 2 * 1 = 24 </p><p>注意：0！ = 1 </p></section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>factorial</code>是一种功能。
+    testString: assert(typeof factorial === 'function');
+  - text: <code>factorial(2)</code>应该返回一个数字。
+    testString: assert(typeof factorial(2) === 'number');
+  - text: <code>factorial(3)</code>应该返回6.“）
+    testString: assert.equal(factorial(3), 6);
+  - text: <code>factorial(3)</code>应返回120.“）
+    testString: assert.equal(factorial(5), 120);
+  - text: '<code>factorial(3)</code>应返回3,628,800。“）'
+    testString: assert.equal(factorial(10), 3628800);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function factorial (n) {
+  // Good luck!
+}
+
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+console.info('after the test');
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>