Ux branch bugs cherry picked 2

[\#822585](https://bugzilla.mozilla.org/show_bug.cgi?id=822585) - [FTU UX VD] Change final illustration of the hand
[\#827804](https://bugzilla.mozilla.org/show_bug.cgi?id=827804) - [Lockscreen UX] Entering passcode. "Emergency call" and "Cancel" buttons should be vertically centered
[\#823793](https://bugzilla.mozilla.org/show_bug.cgi?id=823793) - [B2G][Browser]: Long site names and addresses in the Top Sites/Bookmark/History tabs do not have their text truncated gracefully
[\#829023](https://bugzilla.mozilla.org/show_bug.cgi?id=829023) - [Settings] Don't use dividers to separate paragraphs in the same text block
[\#835774](https://bugzilla.mozilla.org/show_bug.cgi?id=835774) - [Building Blocks] [Filters] Left border should be removed
[\#830380](https://bugzilla.mozilla.org/show_bug.cgi?id=830380) - [FTU UX VD] Tutorial. Replace the third image
[\#828890](https://bugzilla.mozilla.org/show_bug.cgi?id=828890) - [Settings] Scroll bar should not go over the header