Release v0.4.1

This is not the latest release. You can find our latest release, v.1.2.6, here.

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In this release, we fix a bug in the automatic cleanup process.

• Fixed the cleanup logic, which tried to delete submit tokens from submissions that are still stored in the database (reported by Digi92, #97).
• Adjusted the name of a property, which was misleading and made the search for the cleanup bug more complicated.