Hi,
Those can be translated with poedit.
http://swiftideas.com/documentation/2014/05/26/translation/
This is the code inside sf-header.php located in Atelier/swift-framework/core
if ( is_user_logged_in() ) {
$account_output .= '<li><a href="' . $my_account_link . '" class="admin-link">' . __( "My Account", "swiftframework" ) . '</a></li>' . "\n";
$account_output .= '<li><a href="' . $logout_url . '">' . __( "Sign Out", "swiftframework" ) . '</a></li>' . "\n";
} else {
$account_output .= '<li><a href="' . $login_url . '">' . __( "Login", "swiftframework" ) . '</a></li>' . "\n";
$account_output .= '<li><a href="' . $register_url . '">' . __( "Sign Up", "swiftframework" ) . '</a></li>' . "\n";
}
Hope it helps.
-Rui