Pontoon: Update Spanish (es) localization of TW Power Tools

Co-authored-by: Adrià Vilanova Martínez <me@avm99963.com>
diff --git a/src/static/_locales/es/messages.json b/src/static/_locales/es/messages.json
index 465dde0..7e2660b 100644
--- a/src/static/_locales/es/messages.json
+++ b/src/static/_locales/es/messages.json
@@ -283,6 +283,10 @@
     "message": "Debido a razones técnicas, no se pueden cargar las fotos de perfil de hilos publicados en foros privados.",
     "description": "Helper text which appears when hovering an icon next to a thread, to explain its meaning."
   },
+  "inject_threadlistavatars_invisible_thread_indicator_label": {
+    "message": "Debido a razones técnicas, no se pueden cargar las fotos de perfil de los hilos que no son visibles a usuarios anónimos.",
+    "description": "Helper text which appears when hovering an icon next to a thread, to explain its meaning."
+  },
   "inject_workflows_menubtn": {
     "message": "Ejecuta un flujo de trabajo...",
     "description": "Tooltip of the icon shown above a thread or in thread lists when selecting multiple threads in the Community Console which lets the user show a menu with the worklofws they can run."