Show create button on "most" pages for a master view

tailbone/templates/themes/falafel/base.mako

@@ -303,6 +303,13 @@
                           <span class="header-text">
                             ${h.link_to(instance_title, instance_url)}
                           </span>
+                      % elif master.creatable and master.show_create_link and master.has_perm('create'):
+                          <once-button type="is-primary"
+                                       tag="a" href="${url('{}.create'.format(route_prefix))}"
+                                       icon-left="plus"
+                                       style="margin-left: 1rem;"
+                                       text="Create New">
+                          </once-button>
                       % endif
                       % if master.viewing and grid_index:
                           ${grid_index_nav()}