Add display language support

We can remove this once upstream supports all language packs.

1. Proxies language packs to the service on the backend.
2. NLS configuration is embedded into the HTML for the browser to pick up.  This
   code to generate this configuration is copied from the native portion.
3. Remove navigator.language default since that will prevent the argv file from
   being created if you are changing the language to whatever your browser
   default happens to be.
4. Move the argv.json file to the server instead of in-browser storage.  This is
   where the current locale is stored and currently the server needs to be able
   to read it.
5. Add the locale flag.

Index: code-server/lib/vscode/src/vs/server/node/serverServices.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/server/node/serverServices.ts
+++ code-server/lib/vscode/src/vs/server/node/serverServices.ts
@@ -202,6 +202,9 @@ export async function setupServerService
 		const channel = new ExtensionManagementChannel(extensionManagementService, (ctx: RemoteAgentConnectionContext) => getUriTransformer(ctx.remoteAuthority));
 		socketServer.registerChannel('extensions', channel);
 
+		const languagePackChannel = ProxyChannel.fromService<RemoteAgentConnectionContext>(accessor.get(ILanguagePackService));
+		socketServer.registerChannel('languagePacks', languagePackChannel);
+
 		const encryptionChannel = ProxyChannel.fromService<RemoteAgentConnectionContext>(accessor.get(IEncryptionMainService));
 		socketServer.registerChannel('encryption', encryptionChannel);
 
Index: code-server/lib/vscode/src/vs/base/common/platform.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/base/common/platform.ts
+++ code-server/lib/vscode/src/vs/base/common/platform.ts
@@ -80,8 +80,19 @@ if (typeof navigator === 'object' && !is
 	_isIOS = (_userAgent.indexOf('Macintosh') >= 0 || _userAgent.indexOf('iPad') >= 0 || _userAgent.indexOf('iPhone') >= 0) && !!navigator.maxTouchPoints && navigator.maxTouchPoints > 0;
 	_isLinux = _userAgent.indexOf('Linux') >= 0;
 	_isWeb = true;
-	_locale = navigator.language;
+	_locale = LANGUAGE_DEFAULT;
 	_language = _locale;
+
+	const el = typeof document !== 'undefined' && document.getElementById('vscode-remote-nls-configuration');
+	const rawNlsConfig = el && el.getAttribute('data-settings');
+	if (rawNlsConfig) {
+		try {
+			const nlsConfig: NLSConfig = JSON.parse(rawNlsConfig);
+			_locale = nlsConfig.locale;
+			_translationsConfigFile = nlsConfig._translationsConfigFile;
+			_language = nlsConfig.availableLanguages['*'] || LANGUAGE_DEFAULT;
+		} catch (error) { /* Oh well. */ }
+	}
 }
 
 // Native environment
Index: code-server/lib/vscode/src/vs/code/browser/workbench/workbench.html
===================================================================
--- code-server.orig/lib/vscode/src/vs/code/browser/workbench/workbench.html
+++ code-server/lib/vscode/src/vs/code/browser/workbench/workbench.html
@@ -23,6 +23,9 @@
 		<!-- Workbench Auth Session -->
 		<meta id="vscode-workbench-auth-session" data-settings="{{WORKBENCH_AUTH_SESSION}}">
 
+		<!-- NLS Configuration -->
+		<meta id="vscode-remote-nls-configuration" data-settings="{{NLS_CONFIGURATION}}">
+
 		<!-- Workbench Icon/Manifest/CSS -->
 		<link rel="icon" href="{{BASE}}/_static/src/browser/media/favicon-dark-support.svg" />
 		<link rel="alternate icon" href="{{BASE}}/_static/src/browser/media/favicon.ico" type="image/x-icon" />
@@ -43,17 +46,27 @@
 			self.webPackagePaths[key] = `${baseUrl}/node_modules/${key}/${self.webPackagePaths[key]}`;
 		});
 
-		// Set up nls if the user is not using the default language (English)
 		const nlsConfig = {};
-		const locale = navigator.language;
-		if (!locale.startsWith('en')) {
-			nlsConfig['vs/nls'] = {
-				availableLanguages: {
-					'*': locale
-				},
-				baseUrl: '{{WORKBENCH_NLS_BASE_URL}}'
-			};
-		}
+		try {
+			nlsConfig['vs/nls'] = JSON.parse(document.getElementById("vscode-remote-nls-configuration").getAttribute("data-settings"))
+			if (nlsConfig['vs/nls']._resolvedLanguagePackCoreLocation) {
+				const bundles = Object.create(null)
+				nlsConfig['vs/nls'].loadBundle = (bundle, _language, cb) => {
+					const result = bundles[bundle]
+					if (result) {
+						return cb(undefined, result)
+					}
+					const path = nlsConfig['vs/nls']._resolvedLanguagePackCoreLocation + "/" + bundle.replace(/\//g, "!") + ".nls.json"
+					fetch(`{{WORKBENCH_WEB_BASE_URL}}/../vscode-remote-resource?path=${encodeURIComponent(path)}`)
+						.then((response) => response.json())
+						.then((json) => {
+							bundles[bundle] = json
+							cb(undefined, json)
+						})
+						.catch(cb)
+				}
+			}
+		} catch (error) { /* Probably fine. */ }
 
 		require.config({
 			baseUrl: `${baseUrl}/out`,
Index: code-server/lib/vscode/src/vs/platform/environment/common/environmentService.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/platform/environment/common/environmentService.ts
+++ code-server/lib/vscode/src/vs/platform/environment/common/environmentService.ts
@@ -108,7 +108,7 @@ export abstract class AbstractNativeEnvi
 			return URI.file(join(vscodePortable, 'argv.json'));
 		}
 
-		return joinPath(this.userHome, this.productService.dataFolderName, 'argv.json');
+		return joinPath(this.appSettingsHome, 'argv.json');
 	}
 
 	@memoize
Index: code-server/lib/vscode/src/vs/server/node/remoteLanguagePacks.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/server/node/remoteLanguagePacks.ts
+++ code-server/lib/vscode/src/vs/server/node/remoteLanguagePacks.ts
@@ -30,6 +30,12 @@ export function getNLSConfiguration(lang
 				if (InternalNLSConfiguration.is(value)) {
 					value._languagePackSupport = true;
 				}
+				// If the configuration has no results keep trying since code-server
+				// doesn't restart when a language is installed so this result would
+				// persist (the plugin might not be installed yet for example).
+				if (value.locale !== 'en' && value.locale !== 'en-us' && Object.keys(value.availableLanguages).length === 0) {
+					_cache.delete(key);
+				}
 				return value;
 			});
 			_cache.set(key, result);
@@ -44,3 +50,43 @@ export namespace InternalNLSConfiguratio
 		return candidate && typeof candidate._languagePackId === 'string';
 	}
 }
+
+/**
+ * The code below is copied from from src/main.js.
+ */
+
+export const getLocaleFromConfig = async (argvResource: string): Promise<string> => {
+	try {
+		const content = stripComments(await fs.promises.readFile(argvResource, 'utf8'));
+		return JSON.parse(content).locale;
+	} catch (error) {
+		if (error.code !== "ENOENT") {
+			console.warn(error)
+		}
+		return 'en';
+	}
+};
+
+const stripComments = (content: string): string => {
+	const regexp = /('(?:[^\\']*(?:\\.)?)*')|('(?:[^\\']*(?:\\.)?)*')|(\/\*(?:\r?\n|.)*?\*\/)|(\/{2,}.*?(?:(?:\r?\n)|$))/g;
+
+	return content.replace(regexp, (match, _m1, _m2, m3, m4) => {
+		// Only one of m1, m2, m3, m4 matches
+		if (m3) {
+			// A block comment. Replace with nothing
+			return '';
+		} else if (m4) {
+			// A line comment. If it ends in \r?\n then keep it.
+			const length_1 = m4.length;
+			if (length_1 > 2 && m4[length_1 - 1] === '\n') {
+				return m4[length_1 - 2] === '\r' ? '\r\n' : '\n';
+			}
+			else {
+				return '';
+			}
+		} else {
+			// We match a string
+			return match;
+		}
+	});
+};
Index: code-server/lib/vscode/src/vs/server/node/webClientServer.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/server/node/webClientServer.ts
+++ code-server/lib/vscode/src/vs/server/node/webClientServer.ts
@@ -26,6 +26,7 @@ import { URI } from 'vs/base/common/uri'
 import { streamToBuffer } from 'vs/base/common/buffer';
 import { IProductConfiguration } from 'vs/base/common/product';
 import { isString } from 'vs/base/common/types';
+import { getLocaleFromConfig, getNLSConfiguration } from 'vs/server/node/remoteLanguagePacks';
 import { CharCode } from 'vs/base/common/charCode';
 import { getRemoteServerRootPath } from 'vs/platform/remote/common/remoteHosts';
 
@@ -295,6 +296,8 @@ export class WebClientServer {
 
 		const base = relativeRoot(getOriginalUrl(req))
 		const vscodeBase = relativePath(getOriginalUrl(req))
+		const locale = this._environmentService.args.locale || await getLocaleFromConfig(this._environmentService.argvResource.fsPath);
+		const nlsConfiguration = await getNLSConfiguration(locale, this._environmentService.userDataPath)
 
 		const workbenchWebConfiguration = {
 			remoteAuthority,
@@ -338,6 +341,7 @@ export class WebClientServer {
 			WORKBENCH_NLS_BASE_URL: vscodeBase + (nlsBaseUrl ? `${nlsBaseUrl}${this._productService.commit}/${this._productService.version}/` : ''),
 			BASE: base,
 			VS_BASE: vscodeBase,
+			NLS_CONFIGURATION: asJSON(nlsConfiguration),
 		};
 
 
Index: code-server/lib/vscode/src/vs/server/node/serverEnvironmentService.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/server/node/serverEnvironmentService.ts
+++ code-server/lib/vscode/src/vs/server/node/serverEnvironmentService.ts
@@ -15,6 +15,7 @@ export const serverOptions: OptionDescri
 	'disable-update-check': { type: 'boolean' },
 	'auth': { type: 'string' },
 	'disable-file-downloads': { type: 'boolean' },
+	'locale': { type: 'string' },
 
 	/* ----- server setup ----- */
 
@@ -96,6 +97,7 @@ export interface ServerParsedArgs {
 	'disable-update-check'?: boolean;
 	'auth'?: string
 	'disable-file-downloads'?: boolean;
+	'locale'?: string
 
 	/* ----- server setup ----- */
 
Index: code-server/lib/vscode/src/vs/workbench/workbench.web.main.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/workbench/workbench.web.main.ts
+++ code-server/lib/vscode/src/vs/workbench/workbench.web.main.ts
@@ -109,6 +109,12 @@ registerSingleton(IDiagnosticsService, N
 
 //#region --- workbench contributions
 
+// Localization.  These do not actually import anything specific to Electron so
+// they should be safe.
+import 'vs/workbench/services/localization/electron-sandbox/localeService';
+import 'vs/workbench/contrib/localization/electron-sandbox/localization.contribution';
+import 'vs/platform/languagePacks/browser/languagePacks';
+
 // Output
 import 'vs/workbench/contrib/output/common/outputChannelModelService';
 
Index: code-server/lib/vscode/src/vs/platform/languagePacks/browser/languagePacks.ts
===================================================================
--- /dev/null
+++ code-server/lib/vscode/src/vs/platform/languagePacks/browser/languagePacks.ts
@@ -0,0 +1,18 @@
+import { ProxyChannel } from 'vs/base/parts/ipc/common/ipc';
+import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
+import { ILanguagePackService } from 'vs/platform/languagePacks/common/languagePacks';
+import { IRemoteAgentService } from 'vs/workbench/services/remote/common/remoteAgentService';
+
+// @ts-ignore: interface is implemented via proxy
+export class LanguagePackService implements ILanguagePackService {
+
+	declare readonly _serviceBrand: undefined;
+
+	constructor(
+		@IRemoteAgentService remoteAgentService: IRemoteAgentService,
+	) {
+		return ProxyChannel.toService<ILanguagePackService>(remoteAgentService.getConnection()!.getChannel('languagePacks'));
+	}
+}
+
+registerSingleton(ILanguagePackService, LanguagePackService, true);
