Changing the title of “

Please add below code to your functions.php to remove the ← from the translated string:

/**
 * Remove ← from the '← Back to %s' translation
 */
add_action( 'login_init', function()
{
    add_filter( 'gettext', 'wpse_back_to_site_text', 10, 2 );
} );

function wpse_back_to_site_text( $translated, $untranslated )
{
    // Target the untranslated string
    if( '← Back to %s' === $untranslated )
    {
        // Remove the filter callback
        remove_filter( current_filter(), __FUNCTION__ );

        // Modify the translation
        $translated = __( 'Back to %s' );
    }
    return $translated;
}

where we initiate our custom gettext filter callback, to run only within the login_init hook, to restrict it to the login page.

For details please follow source and details