The new WordPress 3.8 dashboard comes with Open Sans, a Google font that doesn't look good on all computers. Me? I hate it 
I've looked for a way to remove it and the easiest way to do it is by using this plugin: Disable Google Fonts.
If you don't want to install yet another plugin, you can get the code and paste it in your theme's functions.php:
class Disable_Google_Fonts {
public function __construct() {
add_filter( 'gettext_with_context', array( $this, 'disable_open_sans' ), 888, 4 );
add_action( 'after_setup_theme', array( $this, 'register_theme_fonts_disabler' ), 1 );
}public function disable_open_sans( $translations, $text, $context, $domain ) {
if ( 'Open Sans font: on or off' == $context && 'on' == $text ) {
$translations = 'off';
}return $translations;
}public function disable_lato( $translations, $text, $context, $domain ) {
if ( 'Lato font: on or off' == $context && 'on' == $text ) {
$translations = 'off';
}return $translations;
}public function disable_source_sans_pro( $translations, $text, $context, $domain ) {
if ( 'Source Sans Pro font: on or off' == $context && 'on' == $text ) {
$translations = 'off';
}return $translations;
}public function disable_bitter( $translations, $text, $context, $domain ) {
if ( 'Bitter font: on or off' == $context && 'on' == $text ) {
$translations = 'off';
}return $translations;
}public function register_theme_fonts_disabler() {
$template = get_template();switch ( $template ) {
case 'twentyfourteen' :
add_filter( 'gettext_with_context', array( $this, 'disable_lato' ), 888, 4 );
break;
case 'twentythirteen' :
add_filter( 'gettext_with_context', array( $this, 'disable_source_sans_pro' ), 888, 4 );
add_filter( 'gettext_with_context', array( $this, 'disable_bitter' ), 888, 4 );
break;
}
}
}$disable_google_fonts = new Disable_Google_Fonts;
Make sure you load it first, before other functions, so just paste it at the top of functions.php, after the opening php tag.