Add ' *' required markers back

The bootstrap renderer did not do anything to signify required rows.  We
can do this by adding a class for CSS to work on, and add this field in
a more simplified manner.

label-required == append ' *'

pinaxcon/proposals/forms.py

@@ -7,6 +7,8 @@ from .models import TalkProposal, TutorialProposal, MiniconfProposal
 
 class ProposalForm(forms.ModelForm):
 
+    required_css_class = 'label-required'
+
     def clean_description(self):
         value = self.cleaned_data["description"]
         if len(value) > 400:

pinaxcon/registrasion/forms.py

@@ -9,7 +9,7 @@ class YesNoField(forms.TypedChoiceField):
         kwargs['required'] = True
         super(YesNoField, self).__init__(
             *args,
-            coerce=lambda x: x == True,
+            coerce=lambda x: x is True,
             choices=((None, '--------'), (False, 'No'), (True, 'Yes')),
             **kwargs
         )
@@ -18,6 +18,8 @@ class YesNoField(forms.TypedChoiceField):
 class ProfileForm(forms.ModelForm):
     ''' A form for requesting badge and profile information. '''
 
+    required_css_class = 'label-required'
+
     class Meta:
         model = models.AttendeeProfile
         exclude = ['attendee']

pinaxcon/templates/_form_snippet.html

@@ -1,6 +1,12 @@
 {% load pyconau2017_tags %}
 {% load bootstrap %}
 
+{% block extra_style %}
+<style type="text/css">
+  .label-required:after { content: ' *'; }
+</style>
+{% endblock %}
+
 {% if form.non_field_errors %}
   <div class="has-errors">
     {{ form.non_field_errors }}

static/src/css/app.css

@@ -0,0 +1 @@
+.label-required:after { content: '*'; }