Extension ext-network continued:

Extension ext-network continued:
- All button language ids renamed to better naming convention, suffix is
  _SUBMIT because the language id will be placed on a submit button
- Also many other language id renamed
- Referral link and 88x31 button added, now the webmaster (you!) can enter his
  or her referral link and a 88x31 formatted banner which are planned to be
  displayed in guest and member area (not yet finished)
- TODOs.txt updated