fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-5-smallest-multiple.md

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+---
+id: 5900f3711000cf542c50fe84
+challengeType: 5
+title: 'Problem 5: Smallest multiple'
+videoUrl: ''
+localeTitle: 问题5：最小的倍数
+---
+
+## Description
+<section id="description"> 2520是可以除以1到10中的每个数字而没有任何余数的最小数字。从1到<code>n</code>所有数字均可被整除的最小正数是多少？ </section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>smallestMult(5)</code>应该返回60。
+    testString: assert.strictEqual(smallestMult(5), 60);
+  - text: <code>smallestMult(7)</code>应该返回420。
+    testString: assert.strictEqual(smallestMult(7), 420);
+  - text: <code>smallestMult(10)</code>应返回2520。
+    testString: assert.strictEqual(smallestMult(10), 2520);
+  - text: <code>smallestMult(13)</code>应返回360360。
+    testString: assert.strictEqual(smallestMult(13), 360360);
+  - text: <code>smallestMult(20)</code>应该返回232792560。
+    testString: assert.strictEqual(smallestMult(20), 232792560);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function smallestMult(n) {
+  // Good luck!
+  return true;
+}
+
+smallestMult(20);
+
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>