Hi again Mattias
I work with WPML, that you probably know, one of the biggest plugins to make a website fully translatable.
One of the great options of WPML is that you can easily translate yoruself all plugins and their strings.
When I tried to translate the strings of yours (it's very important if I can show this technical message about browsers in French), it didn't react properly.
I wrote to the WPML support and they answered me two things:
1) First, they sent me the internationalized version of your plugin (but the previous version, sorry) that they did themselves. Do you want it ? If yes can you give me your email ?
2) Also, they advised that if you're interested in having your plugin internationalized, you can contact them here http://wpml.org/documentation/theme-compatibility/go-global-program
I don't really know about how much effort it is to have your plugin compatible with WPML, but apparently it's quite simple.
Completely up to you of course, but personnally I would be very happy to be able to translate it!