[PM-6511] New i18n for angular (#8122)

* Use state provider to store preferred language

* migrate preferred language

* Use new i18n provider to get LOCAL_ID

* Fix preloaded english i18n

This is a mock service that forces english translations, it doesn't need the i18n interface that allows changing of locales.

* PR improvements

* Fixup merge

libs/common/src/state-migrations/migrations/32-move-preferred-language.spec.ts

@@ -0,0 +1,77 @@
+import { MockProxy } from "jest-mock-extended";
+
+import { MigrationHelper } from "../migration-helper";
+import { mockMigrationHelper } from "../migration-helper.spec";
+
+import { LOCALE_KEY, PreferredLanguageMigrator } from "./32-move-preferred-language";
+
+function exampleJSON() {
+  return {
+    global: {
+      locale: "en",
+      otherStuff: "otherStuff1",
+    },
+    otherStuff: "otherStuff2",
+  };
+}
+
+function rollbackJSON() {
+  return {
+    global_translation_locale: "en",
+    global: {
+      otherStuff: "otherStuff1",
+    },
+    otherStuff: "otherStuff2",
+  };
+}
+
+describe("PreferredLanguageMigrator", () => {
+  let helper: MockProxy<MigrationHelper>;
+  let sut: PreferredLanguageMigrator;
+
+  describe("migrate", () => {
+    beforeEach(() => {
+      helper = mockMigrationHelper(exampleJSON(), 31);
+      sut = new PreferredLanguageMigrator(31, 32);
+    });
+
+    it("should remove locale setting from global", async () => {
+      await sut.migrate(helper);
+      expect(helper.set).toHaveBeenCalledTimes(1);
+      expect(helper.set).toHaveBeenCalledWith("global", {
+        otherStuff: "otherStuff1",
+      });
+    });
+
+    it("should set locale for global state provider", async () => {
+      await sut.migrate(helper);
+
+      expect(helper.setToGlobal).toHaveBeenCalledTimes(1);
+      expect(helper.setToGlobal).toHaveBeenCalledWith(LOCALE_KEY, "en");
+    });
+  });
+
+  describe("rollback", () => {
+    beforeEach(() => {
+      helper = mockMigrationHelper(rollbackJSON(), 32);
+      sut = new PreferredLanguageMigrator(31, 32);
+    });
+
+    it("should null out new values for global", async () => {
+      await sut.rollback(helper);
+
+      expect(helper.setToGlobal).toHaveBeenCalledTimes(1);
+      expect(helper.setToGlobal).toHaveBeenCalledWith(LOCALE_KEY, null);
+    });
+
+    it("should add locale back to the old global object", async () => {
+      await sut.rollback(helper);
+
+      expect(helper.set).toHaveBeenCalledTimes(1);
+      expect(helper.set).toHaveBeenCalledWith("global", {
+        locale: "en",
+        otherStuff: "otherStuff1",
+      });
+    });
+  });
+});