Added What's New text box to the home page

The idea is that visitors get an immediate  indication of how the
website has changed recently.  Dave Millward's idea.
Clarified some wording

Noticed, while translating to Spanish, this was not clear.
Reduced header font size for Spanish What's new

The Spanish translation of What's New would not fit on a single line
within the box.
Fix a typo
Enlarge the What's New box
Picture and new biog for Ket
Add/enhance metadata
New translation + metadata
New metadata for spanish pages