Rely on `mag_IN` (Magahi - INDIA) being unavailable when running localization
test suites, instead of `pt_BR` that is now available from Travis build images.
Signed-off-by: VirtualTam <virtualtam@flibidi.net>
Use php-intl extension to display datetimes a bit more nicely, depending on the locale.
What changes:
* the day is no longer displayed
* day number and month are ordered according to the locale
* the timezone is more readable (UTC+1 instead of CET)
