fixes #1209 adds emptyText to email address field

It seems a string "undefined" came back from Cookies.get instead of undefined? I dont recall seeing this before. Added placeholder text in the input field and therefore removed the title.
Width on a component means that ExtJs can calculate dimensions for layout. In this context it probably makes no difference to layout, but its there. Its also specified rather than left to the default to match the spatial extent just below.