Add 'repositories' key to GitHub translation

public/locales/en/translation.json

@@ -192,6 +192,7 @@
   "github": {
     "title": "GitHub Stats",
     "description": "An overview of my activity and contributions on GitHub",
+    "repositories": "Repositories",
     "stars": "Stars",
     "forks": "Forks",
     "commits": "Commits",
@@ -200,4 +201,4 @@
     "totalCommits": "Total commits",
     "activity": "Recent activity"
   }
-}
+}