change translatable text programatically

<?php
//Rewrite any gettext field, this works for any translation for any plugin, check the $domain == 'events-manager' to be more specific
function my_em_text_rewrites($translation, $orig, $domain) {
    switch ($orig) {
        case 'Spaces' :
            $translation = 'Tickets';
            break;
    }
    return $translation;
}
add_action ( 'gettext', 'my_em_text_rewrites', 1, 3 );