Adding internationalization functionality for any langage + fix issue 7

This is a modification of pull request "add internationalisation code base and support for french language" I was able to make good use of most of elprincipe's code, I simply modified it to accept additional languages (not only french). Please see the INTERNATIONALIZATION_README.txt to see how things work.

Also fixed issue https://github.com/opentelecoms-org/jscommunicator/issues/7