Bug 12884 find strings to externalize - should be cancelable
instead of a busy cursor it should show a progress dialog with cancelation
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/FindStringsToExternalizeAction.java
private static final String FIND_STRINGS_CHECKBOX= "FindStringAction.checkbox"; 
	
	/**
	 * Creates a new <code>FindStringsToExternalizeAction</code>.
	 * 
	 * @param site the site providing context information for this action