Translated a part of first half

- [x] [Installation](/enja-oss/mocha/blob/master/docs/installation.md)
- [x] [1.2.3.Mocha!](/enja-oss/mocha/blob/master/docs/123-mocha.md)
- [x] [Assertions](/enja-oss/mocha/blob/master/docs/assertions.md)
- [x] [Synchronous code](/enja-oss/mocha/blob/master/docs/synchronous-code.md)
- [x] [Asynchronous code](/enja-oss/mocha/blob/master/docs/asynchronous-code.md)