Uses the new ctrl/text.??.ini files (just a few words translated so far).
Adds the new "lang" user property (to user.tab and JS User class).
The language code is the 2-3 char (e.g. ISO 639-1) abbreviation of a language.
A "blank" language property value (the default), just means to use the
ctrl/text.dat contents.
User-selected alternate language file is loaded upon logon and in the
built-in/hard-coded user default settings menu.
More on the user default settings menu:
- AutoLogin via IP option ('I') to make room for new (I) Language option.
- The cold-keys menu option was removed to make room for Language option
  (via text.dat change to UserDefaultsHotKey)
- Any options disabled via blank text.dat strings will no longer result in
  supported command keys (that could accidentally be struck with hidden
  consequences/effect)
- The user_settings.js will need similar treatment

text/menu/<lang>/* is where alternate language menu files should be stored

New UserDefaultsLanguage text.dat string (inserted before new PasswordChar
string).