Allow a generic language map for each language to reduce key duplication

README.md

@@ -423,6 +423,50 @@ return GetMaterialApp(
 );
 ```
 
+#### Optimum structure for language maps
+
+In order to reduce the repition of language keys when using variants of a language you can place all the keys in a language only key-value dictionary map and then add only the keys that need to be changed to the language variant.
+
+```dart
+import 'package:get/get.dart';
+
+class Messages extends Translations {
+  @override
+  Map<String, Map<String, String>> get keys => {
+        'en': {
+          'hello': 'Hello World',
+          'netAmount': 'Net amount',
+          'tax': 'Tax'
+        },
+        'en_GB': {
+          'tax': 'VAT'
+        },
+        'en_US': {
+          'tax': 'Sales tax'
+        },
+        'de_DE': {
+          'hello': 'Hallo Welt',
+          'netAmount': 'Nettobetrag'
+          'tax': 'Steuer'
+        }
+      };
+}
+```
+
+Using the code above the translations for the keys when using different English language variants is as follows:
+
+| Locale | Key       | Translation | Dictionary map used |
+| ------ | --------- | ----------- | ------------------- |
+| en_GB  | hello     | Hello World | en                  |
+|        | netAmount | Net amount  | en                  |
+|        | tax       | VAT         | en_GB               |
+| en_US  | hello     | Hello World | en                  |
+|        | netAmount | Net amount  | en                  |
+|        | tax       | Sales tax   | en_US               |
+| en_AU  | hello     | Hello World | en                  |
+|        | netAmount | Net amount  | en                  |
+|        | tax       | Tax         | en                  |
+
 ## Change Theme
 
 Please do not use any higher level widget than `GetMaterialApp` in order to update it. This can trigger duplicate keys. A lot of people are used to the prehistoric approach of creating a "ThemeProvider" widget just to change the theme of your app, and this is definitely NOT necessary with **GetX™**.

lib/get_utils/src/extensions/internacionalization.dart

@@ -66,6 +66,9 @@ extension Trans on String {
   // Checks if there is a callback language in the absence of the specific
   // country, and if it contains that key.
   Map<String, String>? get _getSimilarLanguageTranslation {
+    if(Get.translations.containsKey(Get.locale!.languageCode.split("_").first)){
+      return Get.translations[Get.locale!.languageCode.split("_").first];
+    }
     final translationsWithNoCountry = Get.translations
         .map((key, value) => MapEntry(key.split("_").first, value));
     final containsKey = translationsWithNoCountry

test/internationalization/internationalization_test.dart

@@ -12,7 +12,7 @@ void main() {
 
     await tester.pumpAndSettle();
 
-    expect('covid'.tr, 'Corona Virus');
+    expect('covid'.tr, 'Corona Virus (US totals)');
     expect('total_confirmed'.tr, 'Total Confirmed');
     expect('total_deaths'.tr, 'Total Deaths');
 
@@ -31,5 +31,21 @@ void main() {
     expect('covid'.tr, 'Corona Virus');
     expect('total_confirmed'.tr, 'Total Confirmed');
     expect('total_deaths'.tr, 'Total Deaths');
+
+    Get.updateLocale(const Locale('en', 'GB'));
+
+    await tester.pumpAndSettle();
+
+    expect('covid'.tr, 'Corona Virus (UK totals)');
+    expect('total_confirmed'.tr, 'Total Confirmed');
+    expect('total_deaths'.tr, 'Total Deaths');
+
+    Get.updateLocale(const Locale('en', 'AU'));
+
+    await tester.pumpAndSettle();
+
+    expect('covid'.tr, 'Corona Virus');
+    expect('total_confirmed'.tr, 'Total Confirmed');
+    expect('total_deaths'.tr, 'Total Deaths');
   });
 }

test/navigation/utils/wrapper.dart

@@ -61,11 +61,17 @@ class WrapperTranslations extends Translations {
   static Locale? get locale => const Locale('en', 'US');
   @override
   Map<String, Map<String, String>> get keys => {
-        'en_US': {
+        'en': {
           'covid': 'Corona Virus',
           'total_confirmed': 'Total Confirmed',
           'total_deaths': 'Total Deaths',
         },
+        'en_US': {
+          'covid': 'Corona Virus (US totals)',
+        },
+        'en_GB': {
+          'covid': 'Corona Virus (UK totals)',
+        },
         'pt_BR': {
           'covid': 'Corona Vírus',
           'total_confirmed': 'Total confirmado',