fix for bug #393868: js error when I open the view menu in the places organizer (missing the view.sortBy.tags.* string properties)

r=dietrich

browser/locales/en-US/chrome/browser/places/places.properties

@@ -61,6 +61,8 @@ view.sortBy.dateAdded.label=Sort by Added
 view.sortBy.dateAdded.accesskey=A
 view.sortBy.lastModified.label=Sort by Last Modified
 view.sortBy.lastModified.accesskey=M
+view.sortBy.tags.label=Sort by Tags
+view.sortBy.tags.accesskey=T
 
 searchByDefault=Search in Bookmarks
 searchCurrentDefault=Search in '%S'