Maintenance Banner Copy Update (#4515)

* Center the maintenance banner content

* 'grid-container' on the body, not just the text.

* doing site upgrade -> performing maintenance

backend/config/settings.py

@@ -594,6 +594,6 @@
         "start": datetime(2024, 12, 5, 17, tzinfo=timezone.utc),
         "end": datetime(2024, 12, 10, 17, tzinfo=timezone.utc),
         "template_name": "maintenance_20241210.html",
-        "message": "FAC.gov will be doing a site upgrade on Tuesday, December 10, 2024 between 12:00 p.m. and 6:00 p.m ET. During this period, the entire website will be unavailable.",
+        "message": "FAC.gov will be performing maintenance on Tuesday, December 10, 2024 between 12:00 p.m. and 6:00 p.m ET. During this period, the entire website will be unavailable.",
     },
 ]

backend/templates/includes/maintenance_banner.html

@@ -1,13 +1,13 @@
 <section class="usa-alert usa-alert--warning margin-top-0" aria-label="Site alert">
     <div class="usa-alert__body grid-container">
-      <h4 class="usa-alert__heading">Scheduled system upgrade</h4>
+      <h4 class="usa-alert__heading">Scheduled system maintenance</h4>
 
       {% comment %} If a message is given, use it. If not, display a generic message with the timeframe. {% endcomment %}
       <p class="usa-alert__text">
         {% if MAINTENANCE_BANNER_MESSAGE %}
             {{ MAINTENANCE_BANNER_MESSAGE }}
         {% else %}
-            FAC.gov will be doing a site upgrade from {{ MAINTENANCE_BANNER_START_TIME|date:"N j, Y, f A" }} to {{ MAINTENANCE_BANNER_END_TIME|date:"N j, Y, f A" }}. 
+            FAC.gov will be performing maintenance from {{ MAINTENANCE_BANNER_START_TIME|date:"N j, Y, f A" }} to {{ MAINTENANCE_BANNER_END_TIME|date:"N j, Y, f A" }}. 
             During this period, the entire website will be unavailable.
         {% endif %}
       </p>