Translation options

The Multilanguage resource now knows about a Zend_Translate object. At
the moment, Gettext and CSV is supported (but only Gettext has been
tested). The resource object will have translation functions. At the
moment, the common _ is defined. It will have more complex functions
that allow formatting and plural forms.

The Multilanguage view helper has a getResource() function to quickly
get this resource to access the translation functions.

The resource is also stored in Zend_Registry with key
'ZFE_Multilanguage', to quickly access it from elsewhere.