Use new value of SMS_CHAR_COUNT_LIMIT from utils

Admin, API and utils were all defining a value for SMS_CHAR_COUNT_LIMIT.
This value has been updated in notifications-utils to allow text
messages to be 4 fragments long and notifications-admin now gets the value of
SMS_CHAR_COUNT_LIMIT from notifications-utils instead of defining it in
config.

app/config.py

@@ -51,8 +51,6 @@ class Config(object):
     SESSION_COOKIE_SECURE = True
     SESSION_REFRESH_EACH_REQUEST = True
     SHOW_STYLEGUIDE = True
-    # TODO: move to utils
-    SMS_CHAR_COUNT_LIMIT = 459
     WTF_CSRF_ENABLED = True
     WTF_CSRF_TIME_LIMIT = None
     CSV_UPLOAD_BUCKET_NAME = 'local-notifications-csv-upload'

app/main/views/send.py

@@ -15,6 +15,7 @@ from flask import (
 )
 from flask_login import current_user, login_required
 from notifications_python_client.errors import HTTPError
+from notifications_utils import SMS_CHAR_COUNT_LIMIT
 from notifications_utils.columns import Columns
 from notifications_utils.recipients import (
     RecipientCSV,
@@ -852,7 +853,7 @@ def get_template_error_dict(exception):
 
     return {
         'error': error,
-        'SMS_CHAR_COUNT_LIMIT': current_app.config['SMS_CHAR_COUNT_LIMIT'],
+        'SMS_CHAR_COUNT_LIMIT': SMS_CHAR_COUNT_LIMIT,
         'current_service': current_service,
 
         # used to trigger CSV specific err msg content, so not needed for single notification errors.

app/templates/views/pricing.html

@@ -47,7 +47,8 @@
         {% for message_length, charge in [
           ('Up to 160 characters', '1 text message'),
           ('Up to 306 characters', '2 text messages'),
-          ('Up to 459 characters', '3 text messages')
+          ('Up to 459 characters', '3 text messages'),
+          ('Up to 612 characters', '4 text messages'),
         ] %}
           {% call row() %}
             {{ text_field(message_length) }}