What it use and functionality of “Synchronize Translation” in OpenERP? | Odoo

Purpose of that action is to update translation fields with new fields that you potentially added in your module (or changed/overrided).

Potential cases: if you create new module and add new fields on some object, or create new .rml file etc.

For example: add field with string (name) on eng base 'technical_description' and after sync with french you will get that field in view so you can translate it :)

Thank you!!