Allow for localized strings in configuration files

[benmwebb]

Implement a syntax to allow for localized strings in configuration files, e.g.

ServerMOTD="foo"
ServerMOTD[fr]="bar"

str[x] will then be used instead of str if the locale is x.

All strings (including localizations) can be sent between server and client; the client uses its own locale when deciding which string to display.