[CAPE] Updated mySoc pennant navbar

caps/templates/caps/includes/site-header.html

@@ -4,8 +4,8 @@
     <nav class="navbar navbar-expand-md navbar-dark">
         <div class="container-fluid position-relative">
             <a href="https://www.mysociety.org/about/anniversary" id="mysociety-badge" aria-label="20 years of mySociety">
-                <img class="badge-desktop" src="{% static 'caps/img/[email protected]' %}" width="60" height="80" alt="20 years of mySociety">
-                <img class="badge-mobile" src="{% static 'caps/img/[email protected]' %}" width="48" height="60" alt="20 years of mySociety">
+                <img class="badge-desktop" src="{% static 'caps/img/[email protected]' %}" width="60" height="80" alt="A service from mySociety">
+                <img class="badge-mobile" src="{% static 'caps/img/[email protected]' %}" width="48" height="60" alt="A service from mySociety">
             </a>
             <a class="navbar-brand" href="{% url 'home' %}">
                 CAPE