Merged ja, ru, pt languages from collaborators and updated readme

I merged all new language contributions from collaborators @persapiens, @uu and @makatokw and also updated README.rdoc with current URI's to your repo because https://github.com/edavis10/redmine-google-analytics-plugin is deprecated and @edavis10 won't maintain his plugins anymore (see http://projects.littlestreamsoftware.com for details)

The README now points to your repo. Would you like to merge the changes and probably create a [plugin entry on redmine.org](http://www.redmine.org/plugins)?

If you're not interested in hosting/maintaining this plugin anymore, just say and I'll do the job ;-)