✨(frontend) introduce blurring effects for Chromium-based users

Implemented using MediaPipe, which is not supported on Firefox due to
limitations outlined in issue #38 of the track-processors-js repo.

We decided to release this first version exclusively for Chrome to quickly
offer a solution to users. Future iterations will address broader compatibility.

An informational message will be added to notify users that the feature is
experimental. For now, a text label will be used in place of an icon.

src/frontend/src/locales/de/rooms.json

@@ -74,7 +74,14 @@
     }
   },
   "effects": {
-    "activateCamera": ""
+    "activateCamera": "",
+    "notAvailable": "",
+    "blur": {
+      "light": "",
+      "normal": "",
+      "apply": "",
+      "clear": ""
+    }
   },
   "sidePanel": {
     "heading": {