Make subject a textarea

In order for subject lines to have their fields highlighted they have to
be textboxes. This is because the highlighting script only works with
textboxes that don’t scroll, either horizontally, vertically, or be
keying through them.

app/main/forms.py

@@ -212,7 +212,7 @@ class SMSTemplateForm(Form):
 
 class EmailTemplateForm(SMSTemplateForm):
 
-    subject = StringField(
+    subject = TextAreaField(
         u'Subject',
         validators=[DataRequired(message="Can’t be empty")])
 

app/templates/views/edit-email-template.html

@@ -15,8 +15,8 @@
     <form method="post">
       <div class="grid-row">
         <div class="column-two-thirds">
-          {{ textbox(form.name, width='1-1', hint='Your recipients won’t see this') }}
-          {{ textbox(form.subject, width='1-1') }}
+          {{ textbox(form.name, width='1-1', hint='Your recipients won’t see this', rows=10) }}
+          {{ textbox(form.subject, width='1-1', rows=2) }}
         </div>
         <div class="column-two-thirds">
           {{ textbox(form.template_content, highlight_tags=True, width='1-1', rows=8) }}