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/menu/impl/MenuPackageImpl.java
* <!-- end-user-doc -->
	 * @generated
	 */
	private boolean isCreated = false;
	/**
	 * Creates the meta-model objects for the package.  This method is
	 * guarded to have no affect on any invocation but its first.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	public void createPackageContents() {
		if (isCreated) return;
		isCreated = true;
		
		itemEClass = createEClass(ITEM);
		createEAttribute(itemEClass, ITEM__ENABLED);
		createEAttribute(itemEClass, ITEM__SELECTED);
		createEAttribute(itemEClass, ITEM__TYPE);
		handledItemEClass = createEClass(HANDLED_ITEM);
		createEReference(handledItemEClass, HANDLED_ITEM__COMMAND);
		createEAttribute(handledItemEClass, HANDLED_ITEM__WB_COMMAND);
		createEReference(handledItemEClass, HANDLED_ITEM__PARAMETERS);
		menuElementEClass = createEClass(MENU_ELEMENT);
		menuItemEClass = createEClass(MENU_ITEM);
		createEAttribute(menuItemEClass, MENU_ITEM__MNEMONICS);
		menuSeparatorEClass = createEClass(MENU_SEPARATOR);
		menuEClass = createEClass(MENU);
		createEAttribute(menuEClass, MENU__ENABLED);
		menuContributionEClass = createEClass(MENU_CONTRIBUTION);