Use SAS emoji data from matrix-doc

Fixes https://github.com/vector-im/element-web/issues/14947

Much like element-web's Jitsi wrapper build steps, this downloads the emoji JSON at build time to ensure it gets reasonably updated. In the future, the spec might want to consider publishing a dedicated i18n package on npm for this, however this is fine for now. We download rather than copy/paste to ensure we always have an updated copy.

scripts/spec-i18n.js

@@ -0,0 +1,37 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// This is a JS script to remove OS dependencies on downloading a file. Sorry.
+
+const fs = require("fs");
+const path = require("path");
+const mkdirp = require("mkdirp");
+const fetch = require("node-fetch");
+
+console.log("Making res directory");
+mkdirp.sync("res");
+
+// curl -s https://github.com/matrix-org/matrix-doc/raw/master/data-definitions/sas-emoji.json > ./res/sas-emoji.json
+console.log("Downloading sas-emoji.json");
+const fname = path.join("res", "sas-emoji.json");
+fetch("https://github.com/matrix-org/matrix-doc/raw/master/data-definitions/sas-emoji.json").then(res => {
+    const stream = fs.createWriteStream(fname);
+    return new Promise((resolve, reject) => {
+        res.body.pipe(stream);
+        res.body.on('error', err => reject(err));
+        res.body.on('finish', () => resolve());
+    });
+}).then(() => console.log('Done with sas-emoji.json download'));