Eventpage: getDate function

https://github.com/4teamwork/ftw.contentpage/blob/master/ftw/contentpage/content/eventpage.py#L85
Function `getDate` has a strange behavior:
- Whole day events only displays the start date
- Unused time is shown

Do something like:
```python
def getDate(self):
      start = DT2dt(self.start())
      start_date = start.date().strftime('%d.%m.%Y')
      start_time = start.time().strftime('%H:%M')
      end = DT2dt(self.end())
      end_date = end.date().strftime('%d.%m.%Y')
      end_time = end.time().strftime('%H:%M')

      if self.getWholeDay():
          if start_date == end_date:
              return start_date
          return '%s - %s' % (start_date, end_date)

      if start_date == end_date:
          return '%s %s - %s ' % (start_date, start_time, end_time)
      return '%s %s - %s %s ' % (
          start_date, start_time, end_date, end_time)
```

or

```python
def pretty_date(self, brain):
    context = aq_inner(self.context)
    ttool = getToolByName(context, 'translation_service')

    start = brain.start
    end = brain.end

    startYear = start.year()
    endYear = end.year()
    startMonth = ttool.utranslate(domain='plonelocales', msgid=ttool.month_msgid(start.month()),context=context)
    endMonth = ttool.utranslate(domain='plonelocales', msgid=ttool.month_msgid(end.month()),context=context)
    startDay = start.day()
    endDay = end.day()

    datestr = ''
    # multi day event
    if startYear != endYear or startMonth != endMonth or startDay != endDay:
        # multi year
        if startYear != endYear:
            datestr = _(u'pretty_date_multi_year',
                        default=u'${sday}. ${smonth} ${syear} - ${eday}. ${emonth} ${eyear}',
                        mapping={'sday':startDay,'smonth':startMonth, 'syear':startYear,
                                 'eday':endDay, 'emonth':endMonth, 'eyear':endYear})
        # multi Month
        elif startMonth != endMonth:
            datestr = _(u'pretty_date_multi_month',
                        default=u'${sday}. ${smonth} - ${eday}. ${emonth} ${eyear}',
                        mapping={'sday':startDay,'smonth':startMonth,
                                 'eday':endDay, 'emonth':endMonth, 'eyear':endYear})
        # multi day
        else:
            datestr = _(u'pretty_date_multi_day',
                        default=u'${sday}. - ${eday}. ${emonth} ${eyear}',
                        mapping={'sday':startDay,'eday':endDay,
                                 'emonth':endMonth, 'eyear':endYear})
    # same day
    else:
        datestr = _(u'pretty_date_same_day',
                    default=u'${day}. ${month} ${year}',
                    mapping={'day':startDay,'month':startMonth,'year': startYear},)

    return datestr
```