Hii,

Use ir.translation Model Directly

here is example of json-rpc :

Here’s how to create or update a French translation for a product name:

{

  "jsonrpc": "2.0",

  "method": "call",

  "params": {

    "service": "object",

    "method": "execute_kw",

    "args": [

      "your_db",

      2,  // user ID

      "your_password",

      "ir.translation",

      "create",

      [{

        "name": "product.template,name",   // model and field

        "res_id": 123,                     // ID of the product

        "lang": "fr_FR",

        "type": "model",

        "value": "Nom traduit du produit",

        "state": "translated"

      }]

    ]

  },

  "id": 1

}

To update, search the translation first:

ids = models.execute_kw(db, uid, password,

    'ir.translation', 'search', [[

        ['name', '=', 'product.template,name'],

        ['res_id', '=', 123],

        ['lang', '=', 'fr_FR']

    ]])

if ids:

    models.execute_kw(db, uid, password,

        'ir.translation', 'write',

        [ids, {'value': 'Nouveau nom en français'}])

i hope this example is help full