Merge branch 'master' into jgrpp

# Conflicts:
#	src/lang/french.txt
#	src/network/network_udp.cpp

docs/multiplayer.md

@@ -211,3 +211,10 @@ Last updated:    2011-02-16
      communication from an admin tool reach the programme. See section 1
      'Starting a server' further up for the ports and protocols used by OpenTTD.
      The ports can be configured in the config file.
+
+ - My advertising server warns a lot about getaddrinfo taking N seconds
+     This could be a transient issue with your (local) DNS server, but if the
+     problem persists there is likely a configuration issue in DNS resolving
+     on your computer. This seems to be a common configuration issue for
+     Docker instances, where the DNS resolving waits for a time out of usually
+     5 seconds.