Hi giusy,
modules in Joomla are defined at the back end at extensions -> modules. There You can enable/disable and delete (button trash) modules.
The language is selected automatically by Joomla, if You have set up a multi-language site. Then You only have to ensure, You selected
all at language setting of the module. Up to version 2.2.1 of BwPostman the Italian language files are installed automatically at installation of BwPostman. But You can ensure, they are installed by installing the separate language pack, which You can download
here
. This don't disturb, because with version 2.3.0 of BwPostman (release date planned 2019-04-25) this is necessary anyway.
Hth
Romana