As of WordPress 4.3, there are label options for ‘featured_image’, ‘set_featured_image’, ‘remove_featured_image’, and ‘use_featured_image’ that you can set to whatever you text you want to use.
featured_image – defaults to “Featured Image”
set_featured_image – defaults to “Set featured image”
remove_featured_image – defaults to “Remove featured image”
use_featured_image – defaults to “Use as featured image”
See the documentation, here: https://developer.wordpress.org/reference/functions/register_post_type/
WordPress < 4.3
For sites running a version of WordPress lower than 4.3, here’s how to change/filter the featured image metabox title and link text in WordPress:
To use this code, just make these changes:
- Change “my_post_type_name” to the name of the post type for which you want to change the featured image text.
- Change “NEW TITLE TEXT”, “NEW SET TEXT HERE” and “NEW REMOVE TEXT HERE” to the new text you want to use.
- Change “km” to the function prefix & text domain of your choice.
Note: The default “Remove featured image” text is still visible immediately after an image is selected. The code above does not address that.