+ add help menu for edit of article when type is help.
 * adjust code.
 - rm unused code.
 * adjust code.
 * adjust the translation of books.
 - rm unused code.
 * adjust code.
 * adjust deleteBook function.
 * show code instead of book_code.
 * adjust the style.
 - rm unused file.
 - rm unused code.
 * add placeholder.
 * adjust code.
 - rm the unused translation.
Merge branch 'master' of github.com:xirang/chanzhieps