Language disappeared

Hi,
I’ve used Polylang for sometime without any problem. Today I noticed though that the main language (italian) disappeared from my Posts and Pages in wordpress.
Check here. Where is the Italian?

The blog seems to work ok but when I want to edit the Pages in Italian I cant even see them (though the counter says that there are more pages than i can see).

Any idea of what happened? Is it safe to delete the folder Polylang and reinstall it or will I lose some info?
My blog: http://www.fabionodariphoto.com/wrp/

I didn’t change any settings in Polylang but I did have an issue with the plugin Top 10. Even if I disable the plugin, the Italian language doesn’t appear..

Thank you

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