php-gettext is niftier. With its autoemulation we can use native
gettext if the locale support is set up properly, or automatically
fall back to emulated if not. This should address many of the issues
people run into when trying to use different interface languages.
Several places were doing operations that were practically the same
(loading core libraries and setting some variables), with varying
levels of success in remembering to do the right things in the right
order. Making a separate minimal init.php that doesn't worry about
some of the sanity checks and session bumpf makes this cleaner and
easier to maintain.
