Have no access to my Debian laptop at this momment, and Ubuntu has an older version of gettext package, but the script I use to upload translations (ran under Debian Testing) runs an msgfmt check before uploading, and it didn't shouted any error... don't know why.
Anyway, this syntax error has been present since several years ago, but it never was a problem (maybe because gettext didn't take care of it). Don't if it's due a bug in Gtranslator, Damned Lies or where, but I'm sure this same error will be present in (so much) other PO files.
Joanmarie: To quickly override it for now, please fix it yourself and use it to create the package.