Saved pages & recent 'empty' icons/texts

SVG images as provided on design board, with helper scripts
hidden to rasterize them. Padding was removed from 'recent.svg'

Implementation card: https://trello.com/c/DGjzJkqI/
Design card: https://trello.com/c/UBJoQ8IL/

Also updated the strings file extracted from storyboard, and
added a script to update the English file from the base storyboard
which Xcode 5 doesn't automatically do.

Change-Id: I592fe59c6a6eae329670693148a1d6ebb300a2c5
Merge "Saved pages & recent 'empty' icons/texts"