Switch from Gares & Connexion (P3104) to SNCF station codes (P8181)
SNCF station codes a strict superset, and also cover e.g. foreign stations not managed by Gares & Connexions, and thus is what we actually want here to make international tickets work as well. This only recently became available in Wikidata though. This does not contain the actual db update yet, that will happen as part of the removal of the explicit timezone information.
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