[AAE-46242] - Changed the name convention for translation files to ISO standard naming (#11924)

* [AAE-46242] - Changed the name convention for translation files to ISO standard naming

* [AAE-46242] - revert en-GB to en.json

* [AAE-46242] - fixed crowding config

* [AAE-46242] - added fallback fix'

* [AAE-46242] - Added defaultLang missing method

* [AAE-46242] - Fixing unit test

* [AAE-46242] - fixed core unit tests

lib/insights/karma.conf.js

@@ -17,7 +17,7 @@ module.exports = function (config) {
                 served: true,
                 watched: false
             },
-            { pattern: 'lib/insights/src/lib/i18n/**/en.json', included: false, served: true, watched: false },
+            { pattern: 'lib/insights/src/lib/i18n/**/en-GB.json', included: false, served: true, watched: false },
             { pattern: 'lib/config/app.config.json', included: false, served: true, watched: false }
         ],
 
@@ -25,7 +25,7 @@ module.exports = function (config) {
 
         proxies: {
             '/base/assets/': '/base/lib/insights/src/lib/assets/',
-            '/assets/adf-insights/i18n/en.json': '/base/lib/insights/src/lib/i18n/en.json',
+            '/assets/adf-insights/i18n/en-GB.json': '/base/lib/insights/src/lib/i18n/en-GB.json',
             '/app.config.json': '/base/lib/config/app.config.json'
         },