Use relative import for sub blueprints

app/blueprints/auth/forms.py

@@ -60,7 +60,11 @@ class RegistrationForm(FlaskForm):
 
     def validate_username(self, field):
         if User.query.filter_by(username=field.data).first():
-            raise ValidationError('Username already in use')
+            raise ValidationError('Username already registered')
+
+    def validate_terms_of_use_accepted(self, field):
+        if not field.data:
+            raise ValidationError('Terms of Use not accepted')
 
 
 class LoginForm(FlaskForm):

app/blueprints/contributions/spacy_nlp_pipeline_models/forms.py

@@ -1,8 +1,8 @@
 from flask_wtf.file import FileField, FileRequired
 from wtforms import StringField, ValidationError
 from wtforms.validators import InputRequired, Length
-from app.blueprints.contributions.forms import ContributionBaseForm, UpdateContributionBaseForm
 from app.blueprints.services import SERVICES
+from ..forms import ContributionBaseForm, UpdateContributionBaseForm
 
 
 class CreateSpaCyNLPPipelineModelForm(ContributionBaseForm):

app/blueprints/contributions/tesseract_ocr_pipeline_models/forms.py

@@ -1,7 +1,7 @@
 from flask_wtf.file import FileField, FileRequired
 from wtforms import ValidationError
-from app.blueprints.contributions.forms import ContributionBaseForm, UpdateContributionBaseForm
 from app.blueprints.services import SERVICES
+from ..forms import ContributionBaseForm, UpdateContributionBaseForm
 
 
 class CreateTesseractOCRPipelineModelForm(ContributionBaseForm):