I made a ticket for one of the developers to restore that filter. In the meantime I can advise using a translation function like this one:
function jackb_custom_filter_gettext( $translated, $original, $domain ) {
// This is an array of original strings
// and what they should be replaced with
$strings = array(
'Finalize Registration' => 'Finalise Registration / Payment',
// Add some more strings here
);
// See if the current string is in the $strings array
// If so, replace its translation
if ( isset( $strings[$original] ) ) {
// This accomplishes the same thing as __()
// but without running it through the filter again
$translations = get_translations_for_domain( $domain );
$translated = $translations->translate( $strings[$original] );
}
return $translated;
}
add_filter( 'gettext', 'jackb_custom_filter_gettext', 10, 3 );
Note where it shows where you can add more strings if you’d like.
the 10 means priority 10, the 3 means there are 3 arguments passed to the function. In this particular use, the 3 arguments are $translated, $original, $domain.
You can refer to the codex article for the add_filter() function for more information and examples that show how add_filter and its parameters work:
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