[FIX] calendar: loading problem with some locales

When you try to load calendar_demo.xml, the loading of demo event
`calendar_event_1` fails with fr_BE locale (and probably some others).

This is due to the rendering of the mail template
`calendar_template_meeting_invitation` (which is used when you create
an event).

This template used a method `get_interval()` in calendar.py, which
does not always return Unicode strings. Furthermore, these strings
are dates and should be formatted according to user locale.

PS: Yeah, we love Python2's management of encodings and Unicode...

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