First translation try with Flask Babel extension

See https://fedorahosted.org/fedocal/ticket/2
Simple translations from templates
Translations from python files
Translate and escape JS messages
Translations with variable,s missing translations
Update translations
Fix a typo, missed translation
Fix escaping issue in JS
Use of LocaleHTMLCalendar instead of HTMLCalendar
Localize calendar view column headers
Fix column header locale
Missing translation, fix a typo
Handle i18n in forms
Translate "after" form messages
Update translations
s/Ical/iCal/ ;)
Missed strings to translate, new translations
pybabel command does not know about lazy_gettext
Missing translations
Take care of meeting coutdown out of popup as well