v0.1.0-beta.6

Added

• Add translations for API error messages. (@dcsjapan)
• Add REST endpoint for listing tags. (@nielstholenaar)

Changed

• Update for compatibility with Flarum v0.1.0-beta.6.
• Rename DiscussionWasTagged event user property to actor.

Fixed

• Fix fatal error when a tag with children is deleted. (@sijad)