diff --git a/_locales/pl/messages.json b/_locales/pl/messages.json
index 088344ae..0b7b90c1 100644
--- a/_locales/pl/messages.json
+++ b/_locales/pl/messages.json
@@ -905,5 +905,8 @@
     },
     "placeholder_mail_quoted_text": {
         "message": "Zacytowany tekst w treści maila"
+    },
+    "placeholder_selected_html": {
+        "message": "Zaznaczony HTML"
     }
 }