* Edit on few texts
The first sort() function title was initially in Chinese, translated to the actual name of the function.
The asort() function title was initially in uppercase, might confuse reader whether uppercase or lowercase to be user, converted to lowercase.
* Add New Book
Added Learning PHP, MySQL & JavaScript: With jQuery, CSS & HTML5 (Learning PHP, MYSQL, Javascript, CSS & HTML5) to the list.
* helping improve the translation quality in index.md
Rephrased the second sentence at the start of the first paragraph to help improve the translation quality. Still a couple of changes I will suggest in the future.
* fix some translation
And also remove junk code between each lifecycle method. Then add index number before each method to help the reader understand the running order better.
I'm a Chinese programmer.
The do while loop we always call it "do while 循环“, we don't translate the "do while" part generally.
And,fixed a word order problem at line 16.
* Translate challenge subtitles and example challenge text to Spanish
* Corrected errors in syntax and punctuation
* Multiple corrections of it/s to its plus other grammar corrections
* Correction and added paragraph to CSS Flex article
* Corrected my own typo
* Corrected capitalization, American spellings and typos
