Fitting a thing to a particular place and tongue. Localization is the work of not requiring a user to travel to be understood.
Latin localis (of a place) with the -izare/-izatio ending (to make into, from Greek -izein) by way of French -isation; the fitting of a thing to a particular place.
The work that lets a person stay where they are and be met in their own tongue rather than travelling to be understood.