Patch Notes: Clearer Arena text

Changed

• Arena buttons and messages are shorter and easier to read: Bet, Find match, Host, Join, Cancel bout, Replay.
• The Herald, recruiters and bookmaker offer short, plain choices.
• Private session messages say plainly what happened and what to do.

What's Changed

• ARENA-COPY: plain, short Arena text and buttons by @Lattymoy in #573

Full Changelog: app-v0.1.5902...app-v0.1.5905