feat: add Russian localization and independent STT languages

tests/server-title-guard.test.ts

@@ -95,7 +95,7 @@ async function serverLaunch(platform: string) {
 	const child = Object.assign(new EventEmitter(), { stdout: new EventEmitter(), stderr: new EventEmitter() });
 	const context = {
 		require: (id: string) => id === "electron" ? {
-			app: { setName() {}, requestSingleInstanceLock: () => false, quit() {}, getPath: () => "/fixture/user-data" },
+			app: { setName() {}, requestSingleInstanceLock: () => false, quit() {}, getPreferredSystemLanguages: () => ["ru-RU"], getPath: () => "/fixture/user-data" },
 		} : id === "node:child_process" ? {
 			spawn(binary: string, args: string[], options: typeof launch.options) {
 				launch = JSON.parse(JSON.stringify({ binary, args, options }));
@@ -128,6 +128,7 @@ describe("backend-only preload wiring and packaging", () => {
 			assert.equal(launch.options.env.PORT, "54321");
 			assert.equal(launch.options.env.HOSTNAME, "127.0.0.1");
 			assert.equal(launch.options.env.FIXTURE, "kept");
+			assert.equal(launch.options.env.LH_SYSTEM_LANGUAGE, "ru-RU");
 			assert.deepEqual(launch.options.stdio, ["ignore", "pipe", "pipe", "ipc"]);
 		});
 	}