v0.18.0

Improvements in this release:

• Add "replace media file" button to media object view (#147)
• Allow editing place name
• Allow editing note type (#148)
• Allow entering year-only or year-month dates and fix issue with date picker (#163)
• Fix issue with type select box (#141, thanks @fuelen)
• Various minor bug fixes
• Translation updates to 17 languages! Thanks to all the translators