Added aria-live to message geolocate button

This attribute will allow users using assistive devices to know the current status of the button. Whenever there message inside the button gets updated it will be read by the assistive devices, especially useful when facing a error messages, currently assistive device users weren't being aware of any errors with the geolocate button.

templates/web/base/around/_postcode_form_geolocation.html

@@ -1,2 +1,2 @@
-<a href="[% url | html %]" id="geolocate_link">[% INCLUDE 'around/geolocate_link_icon.html' %]
+<a href="[% url | html %]" id="geolocate_link" aria-live="polite">[% INCLUDE 'around/geolocate_link_icon.html' %]
   [% loc('Use my current location') %]</a>

templates/web/base/around/geolocate_link_icon.html

@@ -1,2 +1,2 @@
-<svg class="geolocate-link__icon" width="16" height="16" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M23.744.255a.874.874 0 01.18.974l-9.89 22.252a.874.874 0 01-1.603-.012l-3.568-8.332-8.334-3.57a.874.874 0 01-.01-1.602L22.77.075a.874.874 0 01.972.18h.002z" fill="currentColor" fill-rule="nonzero"/></svg>
-<svg class="geolocate-link__loading" width="16" height="16" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg"><g fill="currentColor" fill-rule="nonzero"><path d="M16 8a8 8 0 11-8-8v2a6 6 0 106 6z"></path><circle cx="8" cy="1" r="1"></circle><circle cx="15" cy="8" r="1"></circle></g></svg>
+<svg class="geolocate-link__icon" width="16" height="16" viewBox="0 0 24 24" role="img" aria-hidden="true" xmlns="http://www.w3.org/2000/svg"><path d="M23.744.255a.874.874 0 01.18.974l-9.89 22.252a.874.874 0 01-1.603-.012l-3.568-8.332-8.334-3.57a.874.874 0 01-.01-1.602L22.77.075a.874.874 0 01.972.18h.002z" fill="currentColor" fill-rule="nonzero"/></svg>
+<svg class="geolocate-link__loading" width="16" height="16" viewBox="0 0 16 16"  role="img" aria-hidden="true" xmlns="http://www.w3.org/2000/svg"><g fill="currentColor" fill-rule="nonzero"><path d="M16 8a8 8 0 11-8-8v2a6 6 0 106 6z"></path><circle cx="8" cy="1" r="1"></circle><circle cx="15" cy="8" r="1"></circle></g></svg>