Update transifex api from v2 to v3 (#118)

package.json

@@ -77,6 +77,7 @@
   },
   "devDependencies": {
     "@edx/frontend-build": "11.0.1",
+    "@edx/reactifex": "^2.1.1",
     "@testing-library/jest-dom": "^5.14.1",
     "@testing-library/react": "^12.1.0",
     "axios-mock-adapter": "^1.20.0",
@@ -87,7 +88,6 @@
     "jest-expect-message": "^1.0.2",
     "react-dev-utils": "^11.0.4",
     "react-test-renderer": "^16.14.0",
-    "reactifex": "1.1.1",
     "redux-mock-store": "^1.5.4",
     "semantic-release": "^17.4.5"
   }