Easy way to update a single translation entry without having to translate

Question

I'm using the "Featured Image" meta box which allows you to attach a secondary thumbail to a post. The title for this box is defined in the Wordpress codebase like so:

__('Featured Image')

Which looks to be a wrapper for the translate methods. I'm wondering how to change this text without having to do any translation files. Is it as simple as an action or filter hook?

Answer 1

Sure, the gettext filter does exactly what you require.

Here's some code that should work out of the box:

function wpse31449_translate_my_stuff($translation, $text, $domain) {
    if ($text == 'Featured Image')
        return 'Post Image';
    return $translation;
}
add_filter( 'gettext', 'wpse31449_translate_my_stuff', null, 3 );

Note: if the translation is retrieved with a gettext context (_x() and _ex()) then the gettext_with_context filter has to be hooked to, which passes 4 arguments - the translation, the original string, the context and the domain to your filter.

Let me know if the answer is clear and/or how I can further improve it.