v3.1.0

New features:

• Polish localisation in web UI (thanks @MarioSob) (#180)
• Thumbnails are saved in WEBP format instead of JPEG (#362)
• Optimization: Only fetch ES aggregations on the first request (#357)
• Optimization: Skip encrypted files when no passphrase is supplied (#355)

Breaking changes:

• --thumbnail-quality parameter now takes values from 0-100 instead of 2-32