fix(lang) corrected Dutch translation of toggleCamera

lang/main-nl.json

             "show": "Op podium weergeven",
             "speakerStats": "Sprekerstatistieken in- of uitschakelen",
             "tileView": "Tegelweergave in- of uitschakelen",
-            "toggleCamera": "Camera in- of uitschakelen",
+            "toggleCamera": "Camera wisselen",
             "toggleFilmstrip": "Filmstrip in- of uitschakelen",
             "videomute": "Video dempen in- of uitschakelen",
             "videoblur": "Video vervagen in- of uitschakelen"