remove non-use locales, change brand-copyrights
change default.pdf, logo.png, favicon, and index.html
modified build.gradle. BBB-web development env setup steps: install eclipse and GGTS/gradle, gradle resolveDeps, gradle eclipse
add template in bigbluebutton-web/grails-app/conf/bigbluebutton.properties, another test env's local properties file
change the default welcome message, remove template(unnecessarily)!