Merge pull request #8639 from antobinary/locales-feb-14-2020

bigbluebutton-html5/imports/startup/client/intl.jsx

bigbluebutton-html5/private/locales/ar.json

bigbluebutton-html5/private/locales/de.json

bigbluebutton-html5/private/locales/el_GR.json

bigbluebutton-html5/private/locales/it_IT.json

bigbluebutton-html5/private/locales/pt_BR.json

bigbluebutton-html5/private/locales/sr.json

bigbluebutton-html5/private/locales/th.json

bigbluebutton-html5/private/locales/th_TH.json

bigbluebutton-html5/private/locales/zh_TW.json