Afraid I've never had luck updating the database. I've tried more than a few times. I don't know why it doesn't want to work. It just isn't fool proof, and unfortunately, without knowing what exactly the program is looking for, it's easy to be a fool.
File not found: "data/english.lang". UI will default to English.
arcane.ArcaneException: Unrecognized set "PC2" for card:
Arc Trail at arcane.Card.<init>(Card.java:109)
at arcane.CardDataStore.populate(CardDataStore.java:152)
at arcane.Arcane$DataLoader.loadCardData(Arcane.java:516)
at arcane.Arcane$DataLoader.load(Arcane.java:454)
at arcane.util.Loader.run(Loader.java:95)
at java.lang.Thread.run(Unknown Source)
arcane.ArcaneException: Unrecognized set "PC2" for card:
Arc Trail at arcane.Card.<init>(Card.java:109)
at arcane.CardDataStore.populate(CardDataStore.java:152)
at arcane.Arcane$DataLoader.loadCardData(Arcane.java:516)
at arcane.Arcane$DataLoader.load(Arcane.java:454)
at arcane.util.Loader.run(Loader.java:95)
at java.lang.Thread.run(Unknown Source)
arcane.ArcaneException: Arcane initialization aborted.
at arcane.Arcane.setup(Arcane.java:109)
at arcane.deckbuilder.ui.DeckBuilder.main(DeckBuilder.java:2784)