Switch to nested object pluralisation format for i18n files (#1172)

package.json

@@ -105,7 +105,7 @@
         "fs-extra": "^11.0.0",
         "glob": "^10.0.0",
         "jest": "^29.0.0",
-        "matrix-web-i18n": "^1.3.0",
+        "matrix-web-i18n": "^2.0.0",
         "mkdirp": "^3.0.0",
         "node-pre-gyp": "^0.17.0",
         "pacote": "^15.0.0",