How can I translate "Search" word into my language when no pot/po file is available? 🙁

Hi,

I would like to translate "Search" word in a search box into Polish. Unfortunately I can't find any pot files inside the plugin.

Should I change it direcly in PHP file? This is not elegant and what I want to switch between Polish and English language on my blog?

                    <label for="ucm_search">
                        <?php _e('Search:', 'ucm_search'); ?>
                    </label>