Adds Dutch translation for "toolbar.muteEveryone"

lang/main-nl.json

         "moreActions": "Meer acties",
         "moreOptions": "Meer opties",
         "mute": "Dempen/dempen opheffen",
+        "muteEveryone": "Iedereen dempen",
         "openChat": "Chat openen",
         "pip": "Beeld-in-beeld-modus activeren",
         "profile": "Uw profiel bewerken",