[wtforms translations]

wtforms_translations.py

from flask_wtf import FlaskForm

class MyFlaskForm(FlaskForm):
    class Meta(FlaskForm.Meta):
        def get_translations(self, form):
            return get_translations(["zh", "en"])

    def fetch_an_error(self):
        message = ""
        for _, messages in self.errors.iteritems():
            if len(messages) > 0:
                message = messages[0]
                break
        return message