Allow timer to be configurable.

public/locales/en-GB/app.json

@@ -53,6 +53,7 @@
     "next": "Next",
     "options": "Options",
     "password": "Password",
+    "preferences": "Preferences",
     "profile": "Profile",
     "raise_hand": "Raise hand",
     "settings": "Settings",
@@ -145,6 +146,10 @@
     "feedback_tab_title": "Feedback",
     "more_tab_title": "More",
     "opt_in_description": "<0></0><1></1>You may withdraw consent by unchecking this box. If you are currently in a call, this setting will take effect at the end of the call.",
+    "preferences_tab_body": "Here you can configure extra options for an improved experience",
+    "preferences_tab_h4": "Preferences",
+    "preferences_tab_show_hand_raised_timer_description": "Show a timer when a participant raises their hand",
+    "preferences_tab_show_hand_raised_timer_label": "Show hand raise duration",
     "speaker_device_selection_label": "Speaker"
   },
   "star_rating_input_label_one": "{{count}} stars",