[tldoc] tl manual translations

[Karl Berry]

    OK. How about `glossaries' features?

Feels much too heavy to me.

Since the question does not go away, I changed the three occurrences of
"TL" to \TL{} (with one small rewording), r50390.

    But I'd like other French speaking people to check what I translated

Cool. In that case, let me mention for the future/others that the
revision of the archived version is in the first line of the archived
file. --best, karl.