How to change "Read More" text?

I’m using blogstart wordpress theme and I would like to change "Read more" text to something similar to language than I’m using. How can I do that? I already tried to paste code below to functions.php.

Replaces the excerpt "Read More" text by a link
function modify_read_more_link() {
return '<a class="read-article" href="' . get_permalink() . '">Your Read 
More Link Text</a>';
}
add_filter( 'the_content_more_link', 'modify_read_more_link' );

// Replaces the excerpt "Read More" text by a link
function new_excerpt_more($more) {
   global $post;
return '<a class="read-article" href="'. get_permalink($post->ID) . '"> 
Read the full article...</a>';
}
add_filter('excerpt_more', 'new_excerpt_more');

Can someone help me with that? Thank you!