fix: remove unused new transalation

Author: alvaro-cuesta

backend/decky_loader/locales/en-US.json

@@ -125,7 +125,6 @@
         "freeze": "Freeze updates",
         "hide": "Quick access: Hide",
         "no_plugin": "No plugins installed!",
-        "open": "Open",
         "plugin_actions": "Plugin Actions",
         "reinstall": "Reinstall",
         "reload": "Reload",