clean up localization

lib/pages/rates/discount_by_weight_editor.dart

@@ -2,6 +2,7 @@ import 'package:fcs/domain/entities/discount.dart';
 import 'package:fcs/helpers/theme.dart';
 import 'package:fcs/localization/app_translations.dart';
 import 'package:fcs/pages/main/util.dart';
+import 'package:fcs/pages/widgets/input_text.dart';
 import 'package:fcs/pages/widgets/progress.dart';
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
@@ -38,6 +39,16 @@ class _DiscountByWeightEditorState extends State<DiscountByWeightEditor> {
 
   @override
   Widget build(BuildContext context) {
+
+     final weightBox = InputText(
+        labelTextKey: 'rate.discount.weight',
+        iconData: FontAwesomeIcons.weightHanging,
+        controller: _weightController);
+    final discountRateBox = InputText(
+        labelTextKey: 'rate.discount.rate',
+        iconData: Icons.attach_money,
+        controller: _rateController);
+
     return LocalProgress(
       inAsyncCall: _isLoading,
       child: Scaffold(
@@ -59,10 +70,8 @@ class _DiscountByWeightEditorState extends State<DiscountByWeightEditor> {
               Expanded(
                 child: ListView(
                   children: <Widget>[
-                    fcsInput("Weight", FontAwesomeIcons.weightHanging,
-                        controller: _weightController),
-                    fcsInput("Discount Rate", Icons.attach_money,
-                        controller: _rateController),
+                    weightBox,
+                    discountRateBox,
                     SizedBox(height: 30),
                   ],
                 ),