Updated page titles

lib/presentation/views/about/licenses/license_detail_view.dart

@@ -17,6 +17,7 @@ class LicenseDetailView extends StatelessWidget {
         middle: Text(
           AppLocalizations.of(context).license_details,
         ),
+        previousPageTitle: AppLocalizations.of(context).licenses,
       ),
       child: SafeArea(
         child: SingleChildScrollView(

lib/presentation/views/about/licenses/license_view.dart

@@ -16,6 +16,7 @@ class LicenseView extends StatelessWidget {
     return CupertinoPageScaffold(
       navigationBar: CupertinoNavigationBar(
         middle: Text(AppLocalizations.of(context).licenses),
+        previousPageTitle: AppLocalizations.of(context).about,
       ),
       child: SafeArea(
         child: ListView.builder(