Re-enable "move tree" button (using button enabler)

Fixes #715.
Use 'base' template logo link. Fixes #703.
Merge pull request #718 from ahinz/fix/715/move-tree-button-enable

Re-enable "move tree" button (using button enabler)
Merge pull request #719 from ahinz/fix/703/logo-link

Use 'base' template logo link. Fixes #703.
Fix typos in search.html, Fixes #651
Use standard logo on non-instance pages, fixes #702
Turn off localization in field for editable/data-value numbers, Fixes #665
Only show inline edit fields when they have content to show, Fixes #706
Fixes issue with validation errors showing for fields with no errors

A regression was introduced in 91b7ad99 where validation errors were being
shown when there were validation errors, but then never hidden.

This is now changed to always show/hide validation errors for all events in the
actionStream, but to only show fields which have something in them.