Update Potlatch 2 to 2.3-648-g9cab056 build
Localisation updates from https://translatewiki.net.
Localisation updates from https://translatewiki.net.
Changeset discussions

Add support for commenting on changesets with RSS feeds and email
notification of comments to other commenters and people that have
chosen to subscribe to a changeset.
Tidy up changeset comment code
Tidy up changeset comment tests and beef them up a bit
Move changeset comment feeds out of the API namespace
Update to iD v1.6.1
Update to iD v1.6.2
Fixes for offline mode
Localisation updates from https://translatewiki.net.
Merge branch 'comments'
Add some missing browse icons

Icons for highway=tertiary, highway=track, highway=path and barrier=wall.
Add comments_feed action to various filters

Fixes #825