Hey Roberto,
As far as I can see the attached file is for the frontend.
The files for the backend are located in administrator/language
and the files responsible for the menu is located in en-GB.com_hotspots.sys.ini -> this file is creating the menu entries.
To get some help when translating you can enable debug mode + language debug in joomla's global config.
Also would you like to take care of the Hotspots translations on transifex?
opentranslators.transifex.com/projects/p/compojoom-hotspots/
Kind regards,
Daniel