Update translation files

Updated by "Remove blank strings" add-on in Weblate.

Translation: Trilium Notes/Server
Translate-URL: https://hosted.weblate.org/projects/trilium/server/

apps/server/src/assets/translations/tw/server.json

@@ -188,8 +188,5 @@
     "test_sync": {
         "not-configured": "並未設定同步伺服器主機，請先設定同步",
         "successful": "成功與同步伺服器握手，現在開始同步"
-    },
-    "hidden-subtree": {
-        "available-launchers-title": ""
     }
 }