Change error text

Would like to change the error text only for the GDPR field, as shown in here:
https://cdn.livechat-static.com/api/file/v2/lc/att-old/8801096/5f9c4aa543899fbd6fb01f1af6c364b7/Screenshot%202018-10-28%20at%203.36.06%20PM.png

Please advise any quick workaround regarding this.