fix(deps): update dependency i18n to v0.15.3

Author: renovate[bot]

package.json

@@ -19,7 +19,7 @@
     "downshift": "4.0.7",
     "formik": "2.0.4",
     "history": "4.10.1",
-    "i18n": "0.8.4",
+    "i18n": "0.15.3",
     "i18next": "19.0.3",
     "i18next-browser-languagedetector": "4.0.1",
     "jscpd": "2.0.16",
@@ -54,7 +54,7 @@
     "@testing-library/react": "9.4.0",
     "@testing-library/react-hooks": "3.2.1",
     "@types/flat": "0.0.28",
-    "@types/i18n": "0.8.6",
+    "@types/i18n": "0.13.12",
     "@types/jest": "24.9.0",
     "@types/node": "11.15.4",
     "@types/ramda": "0.26.40",