fix(sos_create_edit): use proper translate msgid's

src/backoffice/templates/backoffice/sos_create_edit.html

@@ -107,7 +107,7 @@
               <span>{% trans "Event_publication_errors" %}</span>
               <ul>
                 {% for field, error in publication_errors.items %}
-                  {% with "SoS__"|add:field as field_name %}
+                  {% with "Event__"|add:field as field_name %}
                     <li>{% trans field_name %}: {{ error.0 }}</li>
                   {% endwith %}
                 {% endfor %}