Hygiene: Introduce border-box class

Apply to
* Carousel for first time uploaders
* Overlays and inputs inside them
* Inputs on login form
* Left navigation drawer and main content drawer
* Upload Progress bar
* Secondary page action links to languages and geonotahack
* Main search input form
* toast
* Textarea in photo upload overlay
* User info box in diff page
* profile page captions
Change-Id: Ifd377b2310f806d002ac2d3e9846765aea59eb9f