Add a formatter for yes/no

This is a bit neater than a bunch of repetetive ternary statements.

app/__init__.py

@@ -62,6 +62,7 @@ from app.formatters import (
     format_number_in_pounds_as_currency,
     format_thousands,
     format_time,
+    format_yes_no,
     id_safe,
     iteration_count,
     linkable_name,
@@ -567,6 +568,7 @@ def add_template_filters(application):
         message_count,
         message_count_noun,
         format_mobile_network,
+        format_yes_no,
     ]:
         application.add_template_filter(fn)
 

app/formatters.py

@@ -518,3 +518,7 @@ def format_mobile_network(network):
 
 def format_billions(count):
     return humanize.intword(count)
+
+
+def format_yes_no(value):
+    return 'Yes' if value else 'No'

app/templates/go-live-request.txt

@@ -9,8 +9,8 @@ Emails in next year: {{ current_service.volume_email|format_thousands }}
 Text messages in next year: {{ current_service.volume_sms|format_thousands }}
 Letters in next year: {{ current_service.volume_letter|format_thousands }}
 
-Consent to research: {{ "Yes" if current_service.consent_to_research else "No" }}
-Other live services for that user: {{ "Yes" if current_user.live_services else "No" }}
+Consent to research: {{ current_service.consent_to_research|format_yes_no }}
+Other live services for that user: {{ current_user.live_services|format_yes_no }}
 
 Service reply-to address: {{ current_service.default_email_reply_to_address or "not set" }}