i18n: fix navbar 'folders' to 'decks' and add follow section

messages/de-DE.json

@@ -237,7 +237,7 @@
     "sourceCode": "GitHub",
     "sign_in": "Anmelden",
     "profile": "Profil",
-    "folders": "Ordner",
+    "folders": "Decks",
     "explore": "Erkunden",
     "favorites": "Favoriten",
     "settings": "Einstellungen"
@@ -463,4 +463,15 @@
     "noFollowers": "Noch keine Follower",
     "noFollowing": "Folgt noch niemandem"
   }
+}
+  },
+  "follow": {
+    "follow": "Folgen",
+    "following": "Folge ich",
+    "followers": "Follower",
+    "followersOf": "{username}s Follower",
+    "followingOf": "{username} folgt",
+    "noFollowers": "Noch keine Follower",
+    "noFollowing": "Folgt noch niemandem"
+  }
 }