Hello,
I got two questions for a website I’m trying to customize. 
Q1, How can I change the “Read More” text to the local language for the site I’m using? I tried to fill in this code, but it seems like there’s a function in the code blocking me from implementing it.

function modify_read_more_link() {
 return '<a class="more-link" href="' . get_permalink() . '">Your Read More Link Text</a>';
}
add_filter( 'the_content_more_link', 'modify_read_more_link' 

Q2, How can I remove the sidebar and the space it takes up, so the the articles will me centered on the site? 

I hope there are some tech wizards out there who could be of help.