Revert AAE-46242 crowdin locale mapping changes (#11949)

Reverts the following commits:
- 80e9e51cfa AAE-46242 - Looks like we need to override the mapping as crowding config is not set to this format
- 345e1e69ad AAE-46242 - should use the variable osx_locale to match the format xx-YY
- a2b026ed7e [AAE-46242] - Changed the name convention for translation files to ISO standard naming

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

lib/insights/karma.conf.js

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