[Dropdown] support HTML5 <datalist> as a source

calendar slows down with attribut "text:"

[Form Validation] Errors on fields that don't have `rules` defined

[label] + [popup] Ribbon label with popup broke

[dropdown] selected sub-menu value does not show on initialization

[Sidebar] `margin-right` and `padding-right` not removed on dynamic sidebar

[toast] using $.toast() instead of $('body').toast() results in infinite JS setTimeout loop

[Comment, Feed] Consistency for `threaded` and `connected`

[popup] display is shifted when `zoom` CSS property is used

[buttons] Group images and buttons