Add a language/locale selector drop-down.

Add a language/locale selector drop-down.

	* src/main/java/org/glom/web/shared/DocumentInfo.java:
	Add getLocaleIDs(), setLocaleIDs(), getLocaleTitles(), setLocaleTitles().
	* /src/main/java/org/glom/web/server/ConfiguredDocument.java:
	getDocumentInfo(): Store the available Locales in the DocumentInfo.
	* src/main/java/org/glom/web/client/ui/TableSelectionView.java:
	* src/main/java/org/glom/web/client/ui/TableSelectionViewImpl.java:
	Add a ListBox to show the available locales. Add getLocaleSelector(),
	setLocaleList(), getSelectedLocale(), setSelectedLocale().
	* src/main/java/org/glom/web/client/event/LocaleChangeEvent.java
	* src/main/java/org/glom/web/client/event/LocaleChangeEventHandler.
	java: Add these classes.
	* src/main/java/org/glom/web/client/activity/TableSelectionActivity.java:
	start(): Fill the locales ListBox. Handle its change event, firing a
	LocaleChangeEvent.
	setPlace(): Show the selected locale as specified by the URL token.
	* src/main/java/org/glom/web/client/activity/DetailsActivity.java:
	* src/main/java/org/glom/web/client/activity/ListActivity.java:
	Handle LocaleChangeEvent, going to a new *Place with that locale.

	The placement of the ListBox is not pretty, and it currently uses the ID
	as a title, instead of "English", "Deutsch", "Espanola", etc, but it
	is a start.