l10n: remove @@locale

lib/l10n/arb/app_de.arb

@@ -1,5 +1,4 @@
 {
-  "@@locale": "de",
   "counterAppBarTitle": "Zähler",
   "@counterAppBarTitle": {
     "description": "Text shown in the AppBar of the Counter Page"

lib/l10n/arb/app_en.arb

@@ -1,5 +1,4 @@
 {
-  "@@locale": "en",
   "counterAppBarTitle": "Counter",
   "@counterAppBarTitle": {
     "description": "Text shown in the AppBar of the Counter Page"

lib/l10n/arb/app_es.arb

@@ -1,5 +1,4 @@
 {
-  "@@locale": "es",
   "counterAppBarTitle": "Contador",
   "@counterAppBarTitle": {
     "description": "Text shown in the AppBar of the Counter Page"

lib/l10n/arb/app_fr.arb

@@ -1,5 +1,4 @@
 {
-  "@@locale": "fr",
   "counterAppBarTitle": "Compteur",
   "@counterAppBarTitle": {
     "description": "Text shown in the AppBar of the Counter Page"

lib/l10n/arb/app_it.arb

@@ -1,5 +1,4 @@
 {
-  "@@locale": "it",
   "counterAppBarTitle": "Contatore",
   "@counterAppBarTitle": {
     "description": "Text shown in the AppBar of the Counter Page"

lib/l10n/arb/app_nl.arb

@@ -1,5 +1,4 @@
 {
-  "@@locale": "nl",
   "counterAppBarTitle": "Teller",
   "@counterAppBarTitle": {
     "description": "Text shown in the AppBar of the Counter Page"

lib/l10n/arb/app_pt.arb

@@ -1,3 +1,2 @@
 {
-  "@@locale": "pt"
 }

lib/l10n/arb/app_zh.arb

@@ -1,3 +1,2 @@
 {
-  "@@locale": "zh"
 }