Language Switcher (or polyglot) and my theme

I’m using the last Language Switcher with WP 2.5.1

I want to translate this part of my code wich is in my sidebar.php

<h2><?php _e('projects.'); ?></h2>
		<ul class="projets">
		<?php wp_get_archives('type=postbypost'); ?>
		</ul>

I know i can translate my whole theme with Poedit etc. But that sound like a lot of works and i would prefer to go the fast and easy way as i have very few things to translate. I think i have read things about doin it directly in the code, not needing to use a MO/PO file etc.

any tip ?

NB. if you know Polyglot the plugin is very similar, your answers could work too.