✨(frontend) add effects quick access from in-conference video controls

Provide direct access to background and effects options from video
device controls during conference for additional user convenience.

Creates another pathway to effects configuration, giving users more
flexibility in accessing video enhancement features while in meetings.

src/frontend/src/locales/nl/rooms.json

@@ -15,6 +15,7 @@
       "audio": "Audio-instellingen",
       "video": "Video-instellingen"
     },
+    "effects": "Pas effecten toe",
     "videoinput": {
       "choose": "Selecteer camera",
       "permissionsNeeded": "Selecteer camera - Toestemming vereist",