Transmission

In Edit ->Preferences -> Peers
In front of the "activate exclusion filter" check box
the button "Update" is translated "Metre à jour"

It should be "Mettre à jour" with two "t"

I hope it is the right place to report that.

And thanks for your awesome work !!

EDIT: Forgot to mention that it's the version 1.51(7963) running on Ubuntu 9.04 Jaunty Beta

the transmission translation for the gtk version is hosted on launchpad so you might want to add a suggestion there.
https://translations.launchpad.net/transmission/

lukeen's got it right. What happens is that I download new translations from launchpad right before every release, so launchpad is definitely the place for you to make corrections.