Use bundle item’s effective name in error and cancel sheets

For example the bundle item “Execute Line / Selection” will (without a selection) show as “Execute Line” in the menu, and now also if the command causes the error sheet to appear or the user press ⌃C / ⌘. to prematurely kill it.
Workaround for “did save” commands stalling TextMate

This became an issue after 10d9464.
Disable plug-ins for HTML output WebView

Also switch about window’s web preferences to be set via identifier instead of manipulating the standard preferences.