How to add/change translatable resources (REST API)?

Question

RESTful API

I am developing a REST API that should return data to the user in the requested language.
For example: the user accesses endpoint /countries, while the header Accept-Language = en. In response, the user receives

[{
    "id": 1,
    "name": "Russia"
},{
    "id": 2,
    "name":"USA"
}]

What about adding translatable resources? In the database they are as follows:
Entities table

• id
  
• some_property
  

EntityTranslations table

• entity_id
  
• language_id
  
• name
  
• description
  
• ...