fix: replace .chinese.md extension with .md

curriculum/challenges/chinese/10-coding-interview-prep/rosetta-code/day-of-the-week.md

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+---
+title: Day of the week
+id: 5966f99c45e8976909a85575
+challengeType: 5
+videoUrl: ''
+localeTitle: 一周中的天
+---
+
+## Description
+<section id="description"><p>一家公司决定，每当圣诞节落在星期天，他们将给予他们的工人所有额外带薪假期，这样，在任何公共假期，工人将不必在下一周（12月25日到1月1日之间）工作。 </p><p>任务： </p><p>编写一个开始年份和结束年份的函数，并返回12月25日为星期日的所有年份的数组。 </p></section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>findXmasSunday</code>是一个函数。
+    testString: assert(typeof findXmasSunday === 'function');
+  - text: '<code>findChristmasSunday(2000, 2100)</code>应该返回一个数组。'
+    testString: assert(typeof findXmasSunday(2000, 2100) === 'object');
+  - text: '<code>findChristmasSunday(2008, 2121</code>应该回归[1977,1983,1988,1994,2005,2011,2016]'
+    testString: assert.deepEqual(findXmasSunday(1970, 2017), firstSolution);
+  - text: '<code>findChristmasSunday(2008, 2121</code>应该返回[2011,2016,2022,2033,2039,2044,2050,2061,2067,2072,2078,2089,2095,2101,2107,2112,2118]'
+    testString: assert.deepEqual(findXmasSunday(2008, 2121), secondSolution);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function findXmasSunday (start, end) {
+  // Good luck!
+  return true;
+}
+
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+console.info('after the test');
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>