How to echo the translated custom field?

can you do this:

get_post_meta(get_the_ID(), '', true);
print_r($meta);

or

get_post_meta(get_the_ID(), 'my_custom_field');
print_r($meta);

the first will pull all custom post type on the current post, and the second restricts to the field. You should get an array and then you’ll know which item in your array is the field title you’re looking to pull. then you can use that to return title