Update _manage_form.htm

fix form title for update context
Merge pull request #791 from negativa/patch-3

Update _manage_form.htm
Refs #792: Improve 'cms.page.beforeDisplay' event to support modifying the page, clean up events
Refs #792 - Fixes logic error
Merge pull request #795 from webmaxx/develop

Added form widget "TimePicker" to Backend.
Refs #795: Combine TimePicker and DatePicker