From v.1.5.1 squirrelmail includes support of plural forms. Currently
there are two strings in newmail plugin and one in fetch_mail plugin. In
order to edit .po files correctly, you might have to add Plural-Forms
header to your translation and use recent version of your favorite gettext
editor. If gettext editor does not support plural forms, it might remove
if you want to find correct Plural-Forms header of your translation.