Modifications required to be done for Etherpad server (version #1.6.1):
Copy the folder /lams_tool_doku/conf/etherpad-lite/src/ over to /${etherpad-lite-server-folder}/src/ 
(it will copy three files /src/node/utils/Settings.js, /src/static/js/pad.js and /src/static/js/pad_userlist.js).