[Commits] [wesnoth/wesnoth] a9b234: Clarified invalid nickname message (fixes #2157)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: a9b234d7e436158a7f30da98e1cd2c1ec7d06491
      https://github.com/wesnoth/wesnoth/commit/a9b234d7e436158a7f30da98e1cd2c1ec7d06491
  Author: Charles Dang <exodia339 at gmail.com>
  Date:   2017-11-03 (Fri, 03 Nov 2017)

  Changed paths:
    M src/game_initialization/multiplayer.cpp

  Log Message:
  -----------
  Clarified invalid nickname message (fixes #2157)

Apparently nicks require at least 1 alphanumeric character, meaning the previous message
was rather confusing, since the apparently valid nickname of "-_-" did not work.