The source node in most cases contains the sample message as written by the developer. If it looks like a dot-delimitted string such as "form.label.firstname", then the developer has not provided a default message.

"{{ value }}" is not a valid ZIP code. "{{ value }}" is not a valid ZIP code. key: "{{ value }}" is not a valid ZIP code. "{{ value }}" is not a valid phone or fax number. "{{ value }}" is not a valid phone or fax number. key: "{{ value }}" is not a valid phone or fax number. Error Error key: Error For technical reason no validation is possible For technical reason no validation is possible key: For technical reason no validation is possible For valid ZIP code use following pattern "{{ pattern }}". For valid ZIP code use following pattern "{{ pattern }}". key: For valid ZIP code use following pattern "{{ pattern }}". From From key: From Maximum {{ limit }} chars Maximum {{ limit }} chars key: Maximum {{ limit }} chars Please accept the terms and conditions Please accept the terms and conditions key: Please accept the terms and conditions Please enter a message Please enter a message key: Please enter a message Please enter a permalink Please enter a permalink key: Please enter a permalink Please enter a valid ZIP Please enter a valid ZIP key: Please enter a valid ZIP Please enter an id Please enter an id key: Please enter an id Please enter minimum {{ limit }} chars Please enter minimum {{ limit }} chars key: Please enter minimum {{ limit }} chars Please provide a valid url Please provide a valid url key: Please provide a valid url Please upload a valid PDF Please upload a valid PDF key: Please upload a valid PDF The message is too short|The message is too short The message is too short|The message is too short key: The message is too short|The message is too short The password fields must match The password fields must match key: The password fields must match. The value is not a valid string. The value is not a valid string. key: The value is not a valid string. The value {{ value }} is not a valid {{ type }}. The value {{ value }} is not a valid {{ type }}. key: The value {{ value }} is not a valid {{ type }}. The vat number must contain the country code The vat number must contain the country code key: The vat number must contain the country code This guid already exists This guid already exists key: This guid already exists This is not a valid vat number This is not a valid vat number key: This is not a valid vat number This value: "{{ value }}" is not a valid email address. This value: "{{ value }}" is not a valid email address. key: This value: "{{ value }}" is not a valid email address. To To key: To User with the email address "{{ email }}" is already registered User with the email address "{{ email }}" is already registered key: User with the email address "{{ email }}" is already registered