fix: translate leftover hardcoded ui text

plugins/session-recording/locales/en.json

@@ -45,5 +45,9 @@
     "loadError": "Failed to load session logs",
     "deleteError": "Failed to delete session log",
     "filterByHost": "Filter by host..."
+  },
+  "player": {
+    "timeline": "Recording timeline",
+    "speed": "Playback speed"
   }
 }