change text of Close button for invalidate-all modal to Cancel
change text of Close button for invalidate-all modal to Cancel

stefanb/osm-tasking-manager2,KaiDalgleish/osm-tasking-manager2,KaiDalgleish/osm-tasking-manager2,stefanb/osm-tasking-manager2,KaiDalgleish/osm-tasking-manager2,ethan-nelson/osm-tasking-manager2,stefanb/osm-tasking-manager2,KaiDalgleish/osm-tasking-manager2,ethan-nelson/osm-tasking-manager2,ethan-nelson/osm-tasking-manager2,ethan-nelson/osm-tasking-manager2,stefanb/osm-tasking-manager2