HUE-2016 [core] Improve the shadows for stateful buttons

Added more box shadow
HUE-2011 [impala] Autocomplete a non existing table hangs

Added new type of quiet error
Removed spinner on error
HUE-1888 [beeswax] Code mirror placeholder i18n

Used jQuery to convert twice from html to text
HUE-1989 [core] Welcome tour on the home page

Only on the home page that way it won't conflict with the admin wizard.
Fix typo in Beeswax.