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Formfield type error in custom language

#1 by AndyFM

Hi all,

I'm trying to customise the default field validation to have the message in a language that is not available by default.
So far, if a respondent tries to proceed without inputting a value and the field is necessary, a black bubble appears below the field saying "Please enter a number" (see attachment).
I'm trying to customise that without success.

I am aware of the methods "FIELD_error_message" and "error_message" but that is not what I'm looking for (I think!): I don't want a red message saying that the input is wrong, just the translation of that black bubble saying that it is missing or of invalid format.

How should I go about this?

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