Add display language support

This likely needs tweaking if we want to upstream.

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
@@ -198,6 +198,9 @@ export async function setupServerService
 		const channel = new ExtensionManagementChannel(extensionManagementService, (ctx: RemoteAgentConnectionContext) => getUriTransformer(ctx.remoteAuthority));
 		socketServer.registerChannel('extensions', channel);
 
+		const localizationsChannel = ProxyChannel.fromService<RemoteAgentConnectionContext>(accessor.get(ILocalizationsService));
+		socketServer.registerChannel('localizations', localizationsChannel);
+
 		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
@@ -83,6 +83,17 @@ if (typeof navigator === 'object' && !is
 	_isWeb = true;
 	_locale = navigator.language;
 	_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" />
@@ -38,6 +41,27 @@
 	<script src="{{VS_BASE}}/static/out/vs/loader.js"></script>
 	<script src="{{VS_BASE}}/static/out/vs/webPackagePaths.js"></script>
 	<script>
+		let nlsConfig
+		try {
+			nlsConfig = JSON.parse(document.getElementById("vscode-remote-nls-configuration").getAttribute("data-settings"))
+			if (nlsConfig._resolvedLanguagePackCoreLocation) {
+				const bundles = Object.create(null)
+				nlsConfig.loadBundle = (bundle, _language, cb) => {
+					const result = bundles[bundle]
+					if (result) {
+						return cb(undefined, result)
+					}
+					const path = nlsConfig._resolvedLanguagePackCoreLocation + "/" + bundle.replace(/\//g, "!") + ".nls.json"
+					fetch(`{{VS_BASE}}/vscode-remote-resource?path=${encodeURIComponent(path)}`)
+						.then((response) => response.json())
+						.then((json) => {
+							bundles[bundle] = json
+							cb(undefined, json)
+						})
+						.catch(cb)
+				}
+			}
+		} catch (error) { /* Probably fine. */ }
 		Object.keys(self.webPackagePaths).map(function (key, index) {
 			self.webPackagePaths[key] = new URL(
 				`{{VS_BASE}}/static/remote/web/node_modules/${key}/${self.webPackagePaths[key]}`,
@@ -52,7 +76,8 @@
 					return value;
 				}
 			}),
-			paths: self.webPackagePaths
+			paths: self.webPackagePaths,
+			'vs/nls': nlsConfig,
 		});
 	</script>
 	<script>
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
@@ -105,7 +105,7 @@ 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';
 
 const textMimeType = {
 	'.html': 'text/html',
@@ -277,6 +278,8 @@ export class WebClientServer {
 		} : undefined;
 		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 data = (await util.promisify(fs.readFile)(filePath)).toString()
 			.replace('{{WORKBENCH_WEB_CONFIGURATION}}', escapeAttribute(JSON.stringify({
 				remoteAuthority,
@@ -301,7 +304,8 @@ export class WebClientServer {
 			})))
 			.replace('{{WORKBENCH_AUTH_SESSION}}', () => authSessionInfo ? escapeAttribute(JSON.stringify(authSessionInfo)) : '')
 			.replace(/{{BASE}}/g, base)
-			.replace(/{{VS_BASE}}/g, vscodeBase);
+			.replace(/{{VS_BASE}}/g, vscodeBase)
+			.replace(/{{NLS_CONFIGURATION}}/g, () => escapeAttribute(JSON.stringify(nlsConfiguration)));
 
 		const cspDirectives = [
 			'default-src \'self\';',
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
@@ -14,6 +14,7 @@ export const serverOptions: OptionDescri
 	/* ----- code-server ----- */
 	'disable-update-check': { type: 'boolean' },
 	'auth': { type: 'string' },
+	'locale': { type: 'string' },
 
 	/* ----- server setup ----- */
 
@@ -90,6 +91,7 @@ export interface ServerParsedArgs {
 	/* ----- code-server ----- */
 	'disable-update-check'?: boolean;
 	'auth'?: string
+	'locale'?: string
 
 	/* ----- server setup ----- */
 
Index: code-server/lib/vscode/src/vs/workbench/services/localizations/browser/localizationsService.ts
===================================================================
--- /dev/null
+++ code-server/lib/vscode/src/vs/workbench/services/localizations/browser/localizationsService.ts
@@ -0,0 +1,28 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Coder Technologies. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { ProxyChannel } from 'vs/base/parts/ipc/common/ipc';
+import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
+import { ILocalizationsService } from 'vs/platform/localizations/common/localizations';
+import { IRemoteAgentService } from 'vs/workbench/services/remote/common/remoteAgentService';
+
+/**
+ * Add localizations service for the browser.
+ * @author coder
+ */
+
+// @ts-ignore: interface is implemented via proxy
+export class LocalizationsService implements ILocalizationsService {
+
+	declare readonly _serviceBrand: undefined;
+
+	constructor(
+		@IRemoteAgentService remoteAgentService: IRemoteAgentService,
+	) {
+		return ProxyChannel.toService<ILocalizationsService>(remoteAgentService.getConnection()!.getChannel('localizations'));
+	}
+}
+
+registerSingleton(ILocalizationsService, LocalizationsService, true);
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 +109,10 @@ registerSingleton(ICustomEndpointTelemet
 
 //#region --- workbench contributions
 
+// Localizations
+import 'vs/workbench/contrib/localizations/browser/localizations.contribution';
+import 'vs/workbench/services/localizations/browser/localizationsService';
+
 // Output
 import 'vs/workbench/contrib/output/common/outputChannelModelService';