Localisation comes to coComment
Well, coComment are not letting the grass grow under their feet. When I wrote about the service a few days back, I was told that localisation was in the pipeline, and in the last couple of days they have launched German, French and Spanish localisations of the service.
Following the advice left by one of the coComment team in my comments, I started using the Firefox extension - which works really well and overcomes my inability to remember to click on the bookmarklet. One glitch - it seems to interfere with Movable Type and stops the 'Save' and 'Preview' buttons working on the new entry page - so I've been having to disable and re-enable it quite frequently.