[5.4] Allow getDisplayableAttribute() to be used in custom replacers #18895
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Currently, custom replacers cannot access the getDisplayableAttribute method and so other field names in parameters cannot be replaced with custom attributes. The current solution for this appears to be to extend the Validator, as in #9982
By passing the Validator instance to custom replacers as an additional argument and making the getDisplayableAttribute() method public we can add this functionality.