String Translation not working

HEllo

Congrats for your Plug in it is perfect

But I have a small problem.I am trying to translate some strings but nothing happens.
I google a lot, I tried to deactivate all plug in exept the Polylang,I re install it but nothing.
I created new widgets for languages and now i want to translate the copyrights
and change the logo to english version from greek

Could you help me?
The link is http://488895360.linuxzone60.grserver.gr/IosHotel/iosfinal2/home/

https://wordpress.org/plugins/polylang/