Updated wikifont and preview license/CC copy.

Split out supplemental font glyphs to separate font file.

Updated licence copy on preview page to include CC glyph.

"Log in" text in license copy now now tappable to enable
user to log in. Note that login interface will be restyled
in upcoming story.

Change-Id: I8b8b3a3d23d5fe08e8c8cd9539b75c125135ce0e