fix accessibility issues (#1224)

lib/src/screens/settings/display_settings_page.dart

@@ -76,7 +76,7 @@ class DisplaySettingsPage extends BasePage {
                 },
               ),
               if (responsiveLayoutUtil.shouldRenderMobileUI && DeviceInfo.instance.isMobile)
-                SettingsThemeChoicesCell(_displaySettingsViewModel),
+                Semantics(label: S.current.color_theme, child: SettingsThemeChoicesCell(_displaySettingsViewModel)),
             ],
           ),
         );

lib/src/screens/settings/widgets/settings_theme_choice.dart

@@ -54,6 +54,9 @@ class SettingsThemeChoicesCell extends StatelessWidget {
 
                 return Padding(
                   padding: EdgeInsets.all(5),
+                  child: Semantics(
+                    label: e.toString(),
+                    selected: isSelected,
                     child: GestureDetector(
                       onTap: () {
                         _displaySettingsViewModel.setTheme(e);
@@ -108,6 +111,7 @@ class SettingsThemeChoicesCell extends StatelessWidget {
                         ),
                       ),
                     ),
+                  ),
                 );
               }),
         ],

lib/src/widgets/standard_switch.dart

@@ -14,7 +14,10 @@ class StandardSwitch extends StatefulWidget {
 class StandardSwitchState extends State<StandardSwitch> {
   @override
   Widget build(BuildContext context) {
-    return GestureDetector(
+
+    return Semantics(
+      toggled: widget.value,
+      child: GestureDetector(
         onTap: widget.onTaped,
         child: AnimatedContainer(
           padding: EdgeInsets.only(left: 2.0, right: 2.0),
@@ -35,6 +38,7 @@ class StandardSwitchState extends State<StandardSwitch> {
                 shape: BoxShape.circle),
           ),
         ),
+      ),
     );
   }
 }