Multilanguage Support via gettext

- added gettext encapsulations to all texts i thought necessary
- added fallback function for the case that the gettext extension isn't loaded
- added browser language detection
- added gettext to the list of optional extensions in setup
- rewritten some of the texts to use sprintf instead of appending strings
- added german translation file
- removed mark_overdue-confirm from cannedresponses.inc.php

extend multi language support and a fex fixes

- Better detection of translation files
- Added functionality to redirect language codes (see redirecting
language codes)
- Ticket Status can be translated
- The Datepicker can be translated
- Extended functionality of 'testlang.php' to show what language code is
used to translate

Forgotten to apply a patch from RC5 to RC6

- Forgotten to change $var to $vars in line 380 of class.mailfetch.php
- Removed unneeded comment

Added php_gettext as primary translation engine

- Added php_gettext support (thanks to Danilo Segan and Steven
Armstrong)
- php_gettext is now the primary translation engine
- Extended language detection functionality

Add error/misconfiguration checks and fix undefined variables

Also add several lint fixes for packaging

Also, write js and css links to be forcibly reloaded by the browser after
deployment

Make the organization page happy!

Departments without email will use the system default email as the default
outgoing email.

Previously we required an account to associate a user to an organization.

Instead of allowing the backend to send a redirect URL, which doesn't make
sense on the command line

Add CLI import/export support for organizations

Output headers on export

Implement CLI user import/export in a well formatted CSV file. Name and
email address are the only supported fields at the moment.