Bug 667422 - Add localization note for the Web Console panel title string; r=ehsan

DONTBUILD

toolkit/locales/en-US/chrome/global/headsUpDisplay.properties

@@ -137,6 +137,8 @@ webConsolePositionWindow=Window
 
 # LOCALIZATION NOTE (webConsoleWindowTitleAndURL): The Web Console floating
 # panel title, followed by the web page URL.
+# For RTL languages you need to set the LRM in the string to give the URL
+# the correct direction.
 webConsoleWindowTitleAndURL=Web Console - %S
 
 # LOCALIZATION NOTE (Autocomplete.label):