Properly internationalize the When component in EventDatesInfo.jsx

[erral]

Describe the bug The When component is not internationalized and has hard-coded from and to strings to signal event from and to dates:

https://github.com/plone/volto/blob/master/src/components/theme/View/EventDatesInfo.jsx#L90-L92

Additional context Add any other context about the problem here.

This is not as easy as adding formatMessage calls in the from and to strings, we have to be aware that some languages do not work like that. For instance in basque the from and to strings are used like suffixes to the hour or date strings instead of prepositions (something like ${start_date}tik ${end_date}ra, so this needs to be implemented using variables like from ${start_date} to ${end_date} or whatever.

[erral]

For complete reference in classic Plone we are using i18n:translate and i18n:name tags to handle those translations: https://github.com/plone/plone.app.event/blob/master/plone/app/event/browser/formatted_date.pt#L13