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/basic/impl/BasicPackageImpl.java
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;
		
		partEClass = createEClass(PART);
		createEReference(partEClass, PART__MENUS);
		createEReference(partEClass, PART__TOOLBAR);
		createEAttribute(partEClass, PART__CLOSEABLE);
		inputPartEClass = createEClass(INPUT_PART);
		partStackEClass = createEClass(PART_STACK);
		partSashContainerEClass = createEClass(PART_SASH_CONTAINER);
		windowEClass = createEClass(WINDOW);
		createEReference(windowEClass, WINDOW__MAIN_MENU);
		createEAttribute(windowEClass, WINDOW__X);
		createEAttribute(windowEClass, WINDOW__Y);
		createEAttribute(windowEClass, WINDOW__WIDTH);
		createEAttribute(windowEClass, WINDOW__HEIGHT);
		createEReference(windowEClass, WINDOW__WINDOWS);
		createEReference(windowEClass, WINDOW__SHARED_ELEMENTS);
		trimmedWindowEClass = createEClass(TRIMMED_WINDOW);
		createEReference(trimmedWindowEClass, TRIMMED_WINDOW__TRIM_BARS);
		trimElementEClass = createEClass(TRIM_ELEMENT);