null safety

lib/pages/widgets/input_date.dart

@@ -10,19 +10,19 @@ class InputDate extends StatelessWidget {
   final String labelTextKey;
   final IconData iconData;
   final TextEditingController controller;
-  final FormFieldValidator<String> validator;
+  final FormFieldValidator<String>? validator;
   final int maxLines;
   final bool withBorder;
-  final Color borderColor;
-  final TextInputType textInputType;
+  final Color? borderColor;
+  final TextInputType? textInputType;
   final bool autoFocus;
   final String dateFormatString;
 
   const InputDate(
-      {Key key,
-      this.labelTextKey,
-      this.iconData,
-      this.controller,
+      {Key? key,
+      required this.labelTextKey,
+      required this.iconData,
+      required this.controller,
       this.validator,
       this.maxLines = 1,
       this.withBorder = false,
@@ -72,7 +72,7 @@ class InputDate extends StatelessWidget {
             ),
             labelText: labelTextKey == null
                 ? null
-                : AppTranslations.of(context).text(labelTextKey),
+                : AppTranslations.of(context)!.text(labelTextKey),
             labelStyle: languageModel.isEng
                 ? newLabelStyle(color: Colors.black54, fontSize: 20)
                 : newLabelStyleMM(color: Colors.black54, fontSize: 20),