Prevent pre-populating date fields

On the tree detail page, the actions edit->save->edit would cause any
date fields on the page to be populated with the current date. This was
caused by the fact that calling "getDate" on the date picker will always
return a value, even if the text box to which the date picker is
connected is empty.

Fixes #1581
Merge pull request #1586 from jwalgran/topic/prevent-prepopulating-date-fields

Prevent pre-populating date fields
Unlocalize comment id in HTML attribute

Saving threaded comments was failing because id 1000 was being added to
the DOM as "1,000"

Closes #1594
Merge pull request #1597 from jwalgran/fix/threadded-comment-unlocalize-id

Unlocalize comment id in HTML attribute
Merge branch 'release'

Post-deploy merging of the release branch back into master.