Merge pull request #578 from hedgedoc/renovate/i18n-0.x

Update dependency i18n to ^0.13.0

package.json

@@ -51,7 +51,7 @@
     "handlebars": "^4.5.2",
     "helmet": "^3.21.1",
     "highlight.js": "^9.12.0",
-    "i18n": "^0.8.3",
+    "i18n": "^0.13.0",
     "imgur": "git+https://github.com/hackmdio/node-imgur.git",
     "ionicons": "^2.0.1",
     "jquery": "^3.5.1",