[out:xml][timeout:3600]; ( way(426841259)['wikipedia'='de:Adalbert-Raps-Schule']; ); (._;>;); out meta qt;//['wikipedia tag links to 404']
JOSM Wikipedia plugin
Note to self: online version hosted at https://matkoniecz.github.io/OSM-wikipedia-tag-validator-reports, files are stored at https://github.com/matkoniecz/OSM-wikipedia-tag-validator-reports.