Make Header Bar match mockups
Tidy and dist appdata file
NEWS updates for 3.9.92
Footer widgets
allow localized searches

The default encoding for python2 is ASCII, a localized
character can't be represented using this encoding.

UTF-8 allow represent every character in the Unicode character set.

**UTF-8 is the default encoding for python3
more info: http://docs.python.org/3.3/howto/unicode.html