chore: update messaging in subscription management (#3937)

lib/l10n/intl_en.arb

@@ -5231,5 +5231,6 @@
   "openToJoin": "Open to join",
   "results": "Results",
   "activityDone": "Activity Done!",
-  "moreLabel": "more"
+  "moreLabel": "more",
+  "promoCodeInfo": "Promo codes can be entered on the next page"
 }

lib/pangea/subscription/pages/change_subscription.dart

@@ -198,6 +198,19 @@ class ChangeSubscription extends StatelessWidget {
               ),
           ],
         ),
+        if (kIsWeb)
+          Row(
+            spacing: 8.0,
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              const Icon(Icons.info_outlined),
+              Flexible(
+                child: Text(
+                  L10n.of(context).promoCodeInfo,
+                ),
+              ),
+            ],
+          ),
         const SizedBox(height: 20.0),
       ],
     );

lib/pangea/subscription/pages/settings_subscription_view.dart

@@ -106,7 +106,7 @@ class ManagementNotAvailableWarning extends StatelessWidget {
         }
 
         final DateFormat formatter = DateFormat('yyyy-MM-dd');
-        return L10n.of(context).promoSubscriptionExpirationDesc(
+        return L10n.of(context).trialExpiration(
           formatter.format(currentSubscriptionInfo!.expirationDate!),
         );
       }