Currently, locations master data and people master data cannot be localized in SMAX.
Both locations and people master data should be enabled to be localized.
The attributes to allow localization in locations: Name, Address (all fields).
The attributes to allow localization in people: First Name, Middle Name, Last Name, Name, Description, Distinguished Name, Home location.
Each user has preferred language in his profile in SMAX.
When this user logs in to Service Portal, they have location entity link or people entity link as a user option for some of the offerings.
It the language is English, location list or people list should be in English.
It the language is another one, location list or people list should be in this another language.
There's no workaround good enough today for this.