Bug 306576 Externalization/translation of strings in xmi files
Currently our e4xmi files have various hard-coded English strings that are presented to the user (in particular the "label" attributes). Is there some mechanism already defined for externalization/translation of NLS strings from these xmi files? If not, we need to define one. Creating a new xmi file from scratch for each language won't scale, and won't allow switching languages after the product is installed.
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/advanced/impl/AdvancedPackageImpl.java
* <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PLACEHOLDER__TAGS = BasicPackageImpl.PART_SASH_CONTAINER_ELEMENT__TAGS;
	/**
	 * The feature id for the '<em><b>Widget</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PLACEHOLDER__WIDGET = BasicPackageImpl.PART_SASH_CONTAINER_ELEMENT__WIDGET;
	/**
	 * The feature id for the '<em><b>Renderer</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PLACEHOLDER__RENDERER = BasicPackageImpl.PART_SASH_CONTAINER_ELEMENT__RENDERER;
	/**
	 * The feature id for the '<em><b>To Be Rendered</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PLACEHOLDER__TO_BE_RENDERED = BasicPackageImpl.PART_SASH_CONTAINER_ELEMENT__TO_BE_RENDERED;
	/**