Plone.volto

- [Breaking] Define good known to work well with Volto image scales in ``registry.xml``
GenericSetup profile. When this add-on is installed or the profile is applied, it will
overwrite the existing scales in your Plone site. If you are using specific scales for
your project, make sure they are installed after this addon's profile.

This scales have been tested in real production projects and work well with Volto's
layout and responsive viewports.
[timo, sneridagh]

- Nothing changed yet.

- Fix first level tabs and add nav_title to them
[sneridagh]

- Add ``breadcrumbs_view`` override to include ``nav_title``
[sneridagh]

- Added indexers for `preview_image`, it allows the Volto object browser widget to access it
[sneridagh]

- Missing ZCML for translations
[sneridagh]