e2e146 Deprecated wtforms.validators changed

4 files Authored by Lenka Segura 6 years ago , Committed by Pierre-Yves Chibon 6 years ago ,
    Deprecated wtforms.validators changed
    
    `wtforms.validators.Required` is now
    `wtforms.validators.DataRequired`
    [See here](https://wtforms.readthedocs.io/en/stable/whats_new.html#deprecated-api-s)
    
    Merges #3928
    
        
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