Add multilanguage support for 2-Advanced

Add lang folder with translation file for English and French.
You can simply add new language by translating content of the "lang\en.php" into another language.

In php-login.php, I have added a function to detect user language and to load the translation file if available (english otherwise).

I have modify all the views files to have a HTML header (because utf8 characteres are not well displayed without utf8 header).
I have removed php-login pub from generated html. For security purpose, it's not a good idea to show the login script that you web site is using...
I have merge password_reset_new_password.php and password_reset_request.php into only one file password_reset.php