fixed some icons

refilc/lib/helpers/subject.dart

@@ -74,7 +74,7 @@ class SubjectIcon {
       return SubjectIconData(
           data: createIcon(
               cupertino: CupertinoIcons.compass,
-              material: Icons.hourglass_empty_outlined),
+              material: Icons.explore_outlined),
           name: "safari");
     } else if (RegExp("foldrajz").hasMatch(name)) {
       return SubjectIconData(

refilc/lib/ui/widgets/grade/grade_tile.dart

@@ -267,7 +267,12 @@ class GradeValueWidget extends StatelessWidget {
         textAlign: TextAlign.center,
       );
     } else if (value.valueName.toLowerCase().specialChars() == 'nem irt') {
-      valueText = const Icon(FeatherIcons.slash);
+      valueText = Icon(
+        Icons.edit_off_rounded,
+        size: size / 1.5,
+      );
+
+      color = AppColors.of(context).text;
     } else {
       valueText = Stack(alignment: Alignment.topRight, children: [
         Transform.translate(