Fixing Issue #36 SIP Registration message display

Fixing issue 
https://github.com/opentelecoms-org/jscommunicator/issues/36

In addition to both registration 'up' and 'down' messages being displayed, at times the message would simply be blank.
Apparently this was mainly caused by i18n.js, as during internationalization the js would completely empty the div to insert the translation for the label 'SIP Registration:', eliminating the 'up' and 'down' messages and 'Register' and 'De-register' buttons.