We are looking to implement an automation function.

When the portal language of a customer is changed, we would like to update all of the associated PDF templates and Email templates for that customer to match.

e.g. within a customer object, we would like to update the following:

"default_templates":{  
    "invoice_email_template_id":"",
    "creditnote_email_template_id":"",
    "creditnote_template_name":"",
    "paymentthankyou_email_template_name":"",
    "estimate_template_id":"",
    "paymentthankyou_template_id":"",
    "invoice_email_template_name":"",
    "creditnote_email_template_name":"",
    "invoice_template_id":"",
    "paymentthankyou_email_template_id":"",
    "invoice_template_name":"",
    "estimate_template_name":"",
    "estimate_email_template_id":"",
    "creditnote_template_id":"",
    "paymentthankyou_template_name":"",
    "estimate_email_template_name":""
},

Does anybody know how this would be achieved? Thanks!