Localize field names in routine form

Author: rolandgeider

lib/l10n/app_en.arb

@@ -155,6 +155,8 @@
   "@category": {
     "description": "Category for an exercise, ingredient, etc."
   },
+  "endDate": "End date",
+  "startDate": "Start date",
   "routines": "Routines",
   "newRoutine": "New routine",
   "noRoutines": "You have no routines",

lib/widgets/routines/forms/routine.dart

@@ -108,8 +108,8 @@ class _RoutineFormState extends State<RoutineForm> {
           }
           return null;
         },
-        decoration: const InputDecoration(
-          labelText: 'Start date',
+        decoration: InputDecoration(
+          labelText: i18n.startDate,
           suffixIcon: Icon(
             Icons.calendar_today,
             key: Key('calendarIcon'),
@@ -145,8 +145,8 @@ class _RoutineFormState extends State<RoutineForm> {
         key: const Key('field-end-date'),
         // Stop keyboard from appearing
         readOnly: true,
-        decoration: const InputDecoration(
-          labelText: 'End date',
+        decoration: InputDecoration(
+          labelText: i18n.endDate,
           suffixIcon: Icon(
             Icons.calendar_today,
             key: Key('calendarIcon'),