update en-US

lib/locales/en-US/translation.json

@@ -274,7 +274,7 @@
 
   "markdown_setting": { 
     "markdown_rendering": "You can change Markdown rendering settings.",
-    "validate Line Break": "Validate Line Break"
-
+    "validate Line Break": "Validate Line Break",
+    "treat_text": "Treat line breaking in the text page as < br > in HTML"
  }
 }