- don't make sql request on invalid arguments in password reset form

- fixed several issues
- fixed variable typos
- coding styles

makes the language configurable for each site, it reads the "Lang" parameter from awstats.DOMAIN.conf before it gets deleted and adds the parameter to the content before the new config file is written.
the "-lang" parameter is removed from the awstats-command, so the global value for lang in awstats.conf.local or the value in awstats.DOMAIN.conf gets respected. Closes #3668

updating the website title by the cronjob shouldn't be necessary as it should get updated by the server plugin

Cron logs are in the private directory, not in log directory