Custom button in the main menu with display name, tooltip, and icon:
"mainMenuTitle": {
"de-DE": "Spezial Menü",
"en-GB": "Special menu"
},
"mainMenuTooltip": {
"de-DE": "Spezial menü für zusätzliche Funktionen",
"en-GB": "Special menu for additional function"
},
"mainMenuIcon": "/webapps/3dfindit-enterprise/plugins/plugInDefault.svg",

