Thank you for the comment.
For item 1 – I just tested with greek and it works on our test site http://samplea.wpresidence.net/properties/2-rooms-southwark-4/ We have v1.051 – so maybe a theme update will help. We haven’t met with any issues since 1.02 – and we fixed that in an update. If you need help with the update – we have this video tutorial here – https://www.youtube.com/watch?v=glLmo9J3rgs
For item 2 – the date format needs to be modified in PHP. Please see this forum – http://wpestate.org/forums/topic/change-date-format-in-wpresidence/
If you need more help please open an account and add ticket here http://support.wpestate.org/. Send me your website details so I can do a test and advise.