CSV Import : Items Language Translation

A. Prepare a CSV Template for the Items which you will be updating:

These are the available fields that you can update for an Item's Language Translation:

Item
Language
Display Name
Sales Description
Store Display Name
Store Description
Detailed Description
Featured Description
Page Title
No Price Message
Out of Stock Message

B. CSV Import Process:

- Navigate to Setup > Import /Export > Import CSV Records.
- Import Type - Items; Record Type - Inventory Items.
- Browse for the CSV File. Next.
- Data Handling - Update. Next.
For the Field Mapping, we have: 

    Item – Item Name/Number
    Language – Translation 1: Language
    Display Name - Translation 1 : Display Name
    Sales Description - Translation 1 : Sales Description
    Store Display Name - Translation 1 : Store Display Name
    Store Description - Translation 1 : Store Description
    Detailed Description - Translation 1 : Detailed Description
    Featured Description - Translation 1 : Featured Description
    Page Title - Translation 1 : Page Title
    No Price Message - Translation 1 : No Price Message
    Out of Stock Message - Translation 1 : Out of Stock Message

Next.
Assign an Import Map Name (Optional).
Save and Run.

Note: The Imported Items Translations can be found under Item Record>System Information>Translation.

This is the language that will be displayed in the Web Site if the user selects that language in the Web Store.