fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/project-euler/problem-16-power-digit-sum.md

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+---
+id: 5900f37d1000cf542c50fe8f
+challengeType: 5
+title: 'Problem 16: Power digit sum'
+videoUrl: ''
+localeTitle: 问题16：电源数字总和
+---
+
+## Description
+<section id="description">
+2 <sup> 15 </ sup> = 32768，其位数之和为3 + 2 + 7 + 6 + 8 = 26。
+2 <sup> <code>指数</ code> </ sup>的数字总和是多少？
+</section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>powerDigitSum(15)</code>应该返回26。
+    testString: assert.strictEqual(powerDigitSum(15), 26);
+  - text: <code>powerDigitSum(128)</code>应该返回166。
+    testString: assert.strictEqual(powerDigitSum(128), 166);
+  - text: <code>powerDigitSum(1000)</code>应返回1366。
+    testString: assert.strictEqual(powerDigitSum(1000), 1366);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function powerDigitSum(exponent) {
+  // Good luck!
+  return true;
+}
+
+powerDigitSum(15);
+
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>