Add i18n to storybook (#30268)

* refactor: extract i18n from languageHandler to not import matrix-js-sdk, settings...

* fix: circular deps

* feat: add language selector to storybook

* fix: make visual test works in CI

package.json

@@ -193,6 +193,7 @@
         "@sentry/webpack-plugin": "^3.0.0",
         "@storybook/addon-designs": "^10.0.1",
         "@storybook/addon-docs": "^9.0.12",
+        "@storybook/icons": "^1.4.0",
         "@storybook/react-vite": "^9.0.15",
         "@storybook/test-runner": "^0.23.0",
         "@stylistic/eslint-plugin": "^5.0.0",
@@ -306,6 +307,7 @@
         "typescript": "5.8.3",
         "util": "^0.12.5",
         "vite": "^7.0.1",
+        "vite-plugin-node-polyfills": "^0.24.0",
         "web-streams-polyfill": "^4.0.0",
         "webpack": "^5.89.0",
         "webpack-bundle-analyzer": "^4.8.0",