feat: used l10n string for "Play"

lib/l10n/arb/app_en.arb

@@ -1,7 +1,4 @@
 {
     "@@locale": "en",
-    "counterAppBarTitle": "Counter",
+    "play": "Play"
-    "@counterAppBarTitle": {
-        "description": "Text shown in the AppBar of the Counter Page"
-    }
 }

lib/l10n/arb/app_es.arb

@@ -1,7 +1,4 @@
 {
     "@@locale": "es",
-    "counterAppBarTitle": "Contador",
+    "play": "Jugar"
-    "@counterAppBarTitle": {
-        "description": "Texto mostrado en la AppBar de la página del contador"
-    }
 }

lib/landing/view/landing_page.dart

@@ -1,17 +1,19 @@
 import 'package:flutter/material.dart';
 import 'package:pinball/game/game.dart';
+import 'package:pinball/l10n/l10n.dart';
 
 class LandingPage extends StatelessWidget {
   const LandingPage({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
+    final l10n = context.l10n;
     return Scaffold(
       body: Center(
         child: TextButton(
           onPressed: () =>
               Navigator.of(context).push<void>(PinballGamePage.route()),
-          child: const Text('Start'),
+          child: Text(l10n.play),
         ),
       ),
     );