update-notifier: "$package" string shouldn't be translated

[Sylvie Gallet]

> Indeed, I would know how to do that for a .c source file but the
> translation comes from a .data.in text file which is like that
>
> "<some text>
> .
>   $package
> .
> <some extra text>"
>
> and the translation system splits each line in a string to translate ...
> I'm not sure how that could be replaced or how a comment could be added
> in the middle of the text...

   I understand!

   Cheers,

         - Sylvie