Vsix build task for langpacks (#15489)

* added refreshlangpack command

* added beginning update-localization yml file, also changed langpack location in RLE

* added regex tester

* moved xlf files into new folder structure

* small change to update-localization

* added yaml script for gulp refresh

* added missing dash.

* added better update-localization yml file

* remove update-localization as its not necessary

* added small changes to langpack-compile

* remove upload sourcemaps and write version information

* added more languages

* added vsce packaging

* added automatic langpack handling

* added built locFunc

* fixed refresh-langpack-extension

* working langpack vsix generator made

* added langpacks to files in copyArtifacts and product-build-linux

* changed command to package-langpacks

* removed unnecessary language flags.

* invalid ADS extensions filter explained

* Fix for regex

* removed unnecessary fields to change, and removed langpack-compile

* added doc comments.

* moved xlf files back to old place.

* WIP translation redirect

* isolated vsix build task

* fixed spaces in locFunc.ts

build/lib/locFunc.js

@@ -0,0 +1,49 @@
+"use strict";
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.packageLangpacksStream = void 0;
+const es = require("event-stream");
+const path = require("path");
+const fs = require("fs");
+const stats_1 = require("./stats");
+const File = require("vinyl");
+const glob = require("glob");
+const rename = require("gulp-rename");
+const root = path.dirname(path.dirname(__dirname));
+// Modified packageLocalExtensionsStream from extensions.ts, but for langpacks.
+function packageLangpacksStream() {
+    const langpackDescriptions = glob.sync('i18n/*/package.json')
+        .map(manifestPath => {
+        const langpackPath = path.dirname(path.join(root, manifestPath));
+        const langpackName = path.basename(langpackPath);
+        return { name: langpackName, path: langpackPath };
+    });
+    const builtLangpacks = langpackDescriptions.map(langpack => {
+        return fromLocalNormal(langpack.path)
+            .pipe(rename(p => p.dirname = `langpacks/${langpack.name}/${p.dirname}`));
+    });
+    return es.merge(builtLangpacks);
+}
+exports.packageLangpacksStream = packageLangpacksStream;
+//copied from extensions.
+function fromLocalNormal(extensionPath) {
+    const result = es.through();
+    const vsce = require('vsce');
+    vsce.listFiles({ cwd: extensionPath, packageManager: vsce.PackageManager.Yarn })
+        .then(fileNames => {
+        const files = fileNames
+            .map(fileName => path.join(extensionPath, fileName))
+            .map(filePath => new File({
+            path: filePath,
+            stat: fs.statSync(filePath),
+            base: extensionPath,
+            contents: fs.createReadStream(filePath)
+        }));
+        es.readArray(files).pipe(result);
+    })
+        .catch(err => result.emit('error', err));
+    return result.pipe(stats_1.createStatsStream(path.basename(extensionPath)));
+}