new 4.3 accessibility strings

l10n
#1

Hi,

this file features 24 new accessibility strings n
/sd/source/ui/accessibility.po like:
"PresentationDateAndTime"

What is the preferred way of translating this?

Can we uses spaces or should we use underscores in translations (our
language does not use capitals so extensively as American English or
German)?
This would then be: Datum in čas predstavitve or
Datum_in_čas_predstavitve instead of DatumInČasPredstavitve

Thanks, m.