Hello folks.
Per popular request and as discussed last meeting, here is a paper that
touches up the terminology we use in the core language. I only did [lex] so
far. (only other sections that need fixing are basic and cpp). I'd love
feedback before continuing.

The changes for "removing character" and "removing translation set" are of
different colors.
https://isocpp.org/files/papers/D2749R0.pdf

Note that of course there is a dependency on
https://isocpp.org/files/papers/P2736R0.pdf and a fun 3 ways merge to
operate editorially :)

Let me know what you think,

Corentin