update tts image using Tango icons
update tts image using Tango icons

Islandora/internet_archive_bookreader,gootdude/bookreader,gootdude/bookreader,yankl/bookreader,garyrh/bookreader,yankl/bookreader,openlibrary/bookreader,internetarchive/bookreader,Islandora/internet_archive_bookreader,brisandbeans/bookreader,gootdude/bookreader,nikolas/bookreader,niksu/bookreader,niksu/bookreader,brisandbeans/bookreader,Islandora/internet_archive_bookreader,yankl/bookreader,openlibrary/bookreader,garyrh/bookreader,openlibrary/bookreader,nikolas/bookreader,garyrh/bookreader,Islandora/internet_archive_bookreader,brisandbeans/bookreader,Islandora/internet_archive_bookreader,openlibrary/bookreader,internetarchive/bookreader,niksu/bookreader,garyrh/bookreader,yankl/bookreader,niksu/bookreader,openlibrary/bookreader,brisandbeans/bookreader,brisandbeans/bookreader,gootdude/bookreader,niksu/bookreader,garyrh/bookreader,yankl/bookreader