Read more Button on Blog-Site sometimes visible, sometimes not

I solved the problem now, reading another article with same problem.

Now I only have the last problem, that some buttons show "lees meer" (wanted) and the buttons, which are now shown too after putting code in the function.php, have the title "weiterlesen" (translation from the original read more). How I can change all to "lees meer"?
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The code I put into the function.php:

add_filter( 'wp_trim_excerpt', 'tu_excerpt_metabox_more' );
function tu_excerpt_metabox_more( $excerpt ) {
$output = $excerpt;

if ( has_excerpt() ) {
$output = sprintf( '%1$s <p class="read-more-button-container">%3$s</p>',
$excerpt,
get_permalink(),
__( 'Read more', 'generatepress' )
);
}

return $output;
}

Hi Stephan,

Try changing your PHP code to this:

add_filter( 'wp_trim_excerpt', 'tu_excerpt_metabox_more' );
function tu_excerpt_metabox_more( $excerpt ) {
    $output = $excerpt;

    if ( has_excerpt() ) {
        $output = sprintf( '%1$s <p class="read-more-button-container"><a class="button" href="%2$s">%3$s</a></p>',
            $excerpt,
            get_permalink(),
            "Lees meer"
        );
    }
	
    return $output;
}

Thank you so much Ying, this works fine now :-)

Glad to hear that :)