Migrate translations to keys and switch to Localazy (#26106)

test/setup/setupLanguage.ts

@@ -0,0 +1,30 @@
+/*
+Copyright 2023 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.
+*/
+
+import fetchMock from "fetch-mock-jest";
+import _ from "lodash";
+import { setupLanguageMock as reactSetupLanguageMock } from "matrix-react-sdk/test/setup/setupLanguage";
+
+import en from "../../src/i18n/strings/en_EN.json";
+import reactEn from "../../src/i18n/strings/en_EN.json";
+
+fetchMock.config.overwriteRoutes = false;
+
+export function setupLanguageMock() {
+    reactSetupLanguageMock();
+    fetchMock.get("end:en_EN.json", _.merge(en, reactEn), { overwriteRoutes: true });
+}
+setupLanguageMock();