Fixes #3841: Accessibility: Support exposing current language to screen readers

src/vs/workbench/electron-browser/index.html

@@ -113,8 +113,20 @@
 			process.env['VSCODE_SHARED_IPC_HOOK'] = configuration.sharedIPCHandle;
 
 			// Get the nls configuration into the process.env as early as possible.
+			var nlsConfig = { availableLanguages: {} };
 			if (configuration.userEnv && configuration.userEnv['VSCODE_NLS_CONFIG']) {
-				process.env['VSCODE_NLS_CONFIG'] = configuration.userEnv['VSCODE_NLS_CONFIG'];
+				var config = configuration.userEnv['VSCODE_NLS_CONFIG'];
+				process.env['VSCODE_NLS_CONFIG'] = config;
+				try {
+					if (config) {
+						nlsConfig = JSON.parse(config);
+					}
+				} catch (e) {
+				}
+			}
+			var uiLanguage = nlsConfig.availableLanguages['*'];
+			if (uiLanguage) {
+				window.document.getElementsByTagName('html')[0].setAttribute('lang', uiLanguage)
 			}
 
 			registerListeners(enableDeveloperTools);
@@ -144,17 +156,6 @@
 			// In the bundled version the nls plugin is packaged with the loader so the NLS Plugins
 			// loads as soon as the loader loads. To be able to have pseudo translation
 			createScript(rootUrl + '/vs/loader.js', function() {
-				var nlsConfig;
-				try {
-					var config = process.env['VSCODE_NLS_CONFIG'];
-					if (config) {
-						nlsConfig = JSON.parse(config);
-					}
-				} catch (e) {
-				}
-				if (!nlsConfig) {
-					nlsConfig = { availableLanguages: {} };
-				}
 				require.config({
 					baseUrl: rootUrl,
 					'vs/nls': nlsConfig,