Localizing availability calendar

This should work and it works with me. It uses the standard Drupal date formatting to translate the full month names.

So either the Italian translations on localize.drupal.org do not yet have translations of the full month names, or your translations are outdated.

You can check the former on long month name on localize.drupal.org (=> have been translated)

You can check the latter by installing the Localization update module.

Translations that are (only) used by the Availability Calendars module can be found here. It would be nice if you translate missing strings (like previous month/next month in your example) on the localize.drupal.org site instead of locally on your site. This way other Italian sites can profit as well as you can with a future project where you might want to use this module again. For this you can also install the Localization client module. This way, you translate locally but send your translations to the localize server.

I'm not part of the Italian translate team, so I have no rights to enter Italian translations. I have registered as being able to contribute Dutch translations and can indeed do so. You probably have to indicate somewhere that you want to contribute Italian translations (I don't remember exactly anymore, how to apply).

Closing this issue again, as the problem is not part of this module. If the problem persists, you have to file an issue for localize.drupal.org.