Issue #1952880 by svarc, graphityx, stephen Verdant, areynolds: Properly get the logger language from $logger[language].

the module did not sanitize the log output of addressee information, subject, and body, leading to a Cross-Site Scripting vulnerability

Notice: Undefined variable: tokens in mail_logger_token_list() (line 306 of /var/www/sites/all/modules/mail_logger/mail_logger.module).

#339335 by deekayen: add upgrade path from Drupal 5. It is ignored if the module was first installed with Drupal 6.

#738384 by deekayen, Zolt‡n Balogh: add trigger dependency