Changing 'Leave a Reply' to 'Ask a Question' with Hemingway Theme

The following url explains two ways to do it: one using a plugin and one manually.

https://writenowdesign.com/blog/wordpress/wordpress-how-to/how-to-modify-wordpress-language-files/

'Leave a Reply' is one of the default parameters of ‘commment_form()‘ which is likely to be found in comments.php of your theme;

https://codex.www.ads-software.com/Function_Reference/comment_form

there is a useful filter hook you can use; ‘comment_form_defaults‘

example code to be added into functions.php (of your theme of child theme):

add_filter( 'comment_form_defaults', 'custom_comment_form_defaults' );
function custom_comment_form_defaults( $args ) {
  if( is_page( 'faq' ) ) $args['title_reply'] = 'Ask a Question';
return $args;
}