✨ improve length error message.

closes #4.

prolefeeder.py

@@ -34,7 +34,9 @@ class DownloadForm(FlaskForm):
     length = IntegerField('Länge',
                           validators=[
                               InputRequired(),
-                              NumberRange(min=1, max=app.config['MAX_LENGTH'])])
+                              NumberRange(
+                                  min=1, max=app.config['MAX_LENGTH'],
+                                  message="Länge muss zwischen %(min)s and %(max)s Minuten sein")])
     submit = SubmitField('Download')
 
 

requirements.txt

@@ -2,3 +2,4 @@ flask
 bootstrap-flask
 python-dotenv
 flask-wtf >= 1.0.0
+WTForms >= 3.0.0