Rename left/right edge icons using _ for better consistency.
Rename left/right edge icons using _ for better consistency.

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