How to remove the "Wordpress" word from the <title> panel?

Question

How can I remove the name "Wordpress" from the titles within the administrative panel?

Ex: When you enter the Panel (Dashboard), all pages in the title are named Wordpress, how could I remove that word?

It goes something like this: Painel < Meu Site -- WordPress

I just wanted to: Painel < Meu Site

Answer 1

Here’s the correct way to do this using the filter admin_title:

function custom_admin_title( $admin_title ) {
    return str_replace( ' — WordPress', '', $admin_title );
}

add_filter( 'admin_title', 'custom_admin_title' );

Answer 2

I do not use Wordpress, but I have here. I do not know if it does in the translation package, but I found in the archive wp-admin/admin-header.

Lines 31 - 34

if ( $admin_title == $title )
    $admin_title = sprintf( __( '%1$s — WordPress' ), $title );
else
    $admin_title = sprintf( __( '%1$s ‹ %2$s — WordPress' ), $title, $admin_title );