feat: added legacy mode timer notification copy

_locales/en/messages.json

@@ -182,7 +182,9 @@
   "timerModeRead": "read",
   "timerModeSent": "sent",
   "youChangedTheTimer": "You have set messages to disappear $time$ after they have been $mode$",
+  "youChangedTheTimerLegacy": "You set the disappearing message timer to $time$",
   "theyChangedTheTimer": "$name$ has set messages to disappear $time$ after they have been $mode$",
+  "theyChangedTheTimerLegacy": "$name$ set the disappearing message timer to $time$",
   "timerOption_0_seconds": "Off",
   "timerOption_5_seconds": "5 seconds",
   "timerOption_10_seconds": "10 seconds",

ts/components/conversation/TimerNotification.tsx

@@ -29,8 +29,11 @@ export const TimerNotification = (props: PropsForExpirationTimer) => {
   } = props;
 
   const contact = profileName || pubkey;
+  // TODO legacy messages support will be removed in a future release
   const mode =
-    expirationType === 'deleteAfterRead'
+    expirationType === 'legacy'
+      ? null
+      : expirationType === 'deleteAfterRead'
       ? window.i18n('timerModeRead')
       : window.i18n('timerModeSent');
 
@@ -39,13 +42,17 @@ export const TimerNotification = (props: PropsForExpirationTimer) => {
     case 'fromOther':
       textToRender = disabled
         ? window.i18n('disabledDisappearingMessages', [contact, timespan])
-        : window.i18n('theyChangedTheTimer', [contact, timespan, mode]);
+        : mode
+        ? window.i18n('theyChangedTheTimer', [contact, timespan, mode])
+        : window.i18n('theyChangedTheTimerLegacy', [contact, timespan]);
       break;
     case 'fromMe':
     case 'fromSync':
       textToRender = disabled
         ? window.i18n('youDisabledDisappearingMessages')
-        : window.i18n('youChangedTheTimer', [timespan, mode]);
+        : mode
+        ? window.i18n('youChangedTheTimer', [timespan, mode])
+        : window.i18n('youChangedTheTimerLegacy', [timespan]);
       break;
     default:
       throw missingCaseError(type);