Added a setting "StaffAvatarName" in
Config>Sim>Standalone/WebInterface.ini and
Config>Grid>WebServerConfiguration/WebInterface.ini
updated the error messages on supported languages.

"StaffAvatarName" feature revised.
POST registration information to external URL

Added a setting "ExternalAvatarRegURL" in
Config>Sim>Standalone/WebInterface.ini.example and
Config>Grid>WebServerConfiguration/WebInterface.ini.example
Merge pull request #1 from thish/WebUI

POST registration information to external URL