swh-web: Update license headers for files modified this year

swh/web/admin/adminurls.py

swh/web/admin/origin_save.py

swh/web/api/apidoc.py

swh/web/api/apiresponse.py

swh/web/api/apiurls.py

swh/web/api/utils.py

swh/web/api/views/content.py

swh/web/api/views/directory.py

swh/web/api/views/identifiers.py

swh/web/api/views/origin.py

swh/web/api/views/origin_save.py

swh/web/api/views/person.py

swh/web/api/views/release.py

swh/web/api/views/snapshot.py

swh/web/api/views/stat.py

swh/web/api/views/utils.py

swh/web/api/views/vault.py

swh/web/assets/config/bootstrap-pre-customize.scss

swh/web/assets/src/bundles/admin/origin-save.js

swh/web/assets/src/bundles/browse/browse-utils.js