Hi Luciano,
Of course, these language text are defined in the language file of JA Trip template:
ROOT/language/en-GB/en-GB.tpl_ja_trip.ini
;Tour
TPL_TOUR_TITLE_LABEL = "Book this tour"
TPL_TYPE_LABEL = "Tour Type"
TPL_DURATION_LABEL = "Duration"
TPL_PARTICIPANTS_LABEL = "Participants"
TPL_PRICE_LABEL = "Price"
TPL_CATEGORIES_LABEL = "Categories"
TPL_LOCATION_LABEL = "Location"
TPL_DIFICULTY_LABEL = "Difficulty"
TPL_SERVICE_LABEL = "Service"
TPL_MAP_TITLE_LABEL = "Location Map"
TPL_PLAN_TITLE_LABEL = "Itinerary"
TPL_INCLUDE_TITLE_LABEL = "Included/Excluded "
You can override these language constants as needed: https://docs.joomla.org/Help4.x:Languages:_Overrides
For example: you go to Backend >> System >> Language Overrides:
1/ Select override for Italiano (it-IT) - Site, I suppose you're using Italian.
2/ Click New button and add translation for TPL_TOUR_TITLE_LABEL
constant: