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/PartImpl.java
@Override
	public boolean eIsSet(int featureID) {
		switch (featureID) {
			case BasicPackageImpl.PART__CONTEXT:
				return CONTEXT_EDEFAULT == null ? context != null : !CONTEXT_EDEFAULT.equals(context);
			case BasicPackageImpl.PART__VARIABLES:
				return variables != null && !variables.isEmpty();
			case BasicPackageImpl.PART__PROPERTIES:
				return properties != null && !properties.isEmpty();
			case BasicPackageImpl.PART__WIDGET:
				return WIDGET_EDEFAULT == null ? widget != null : !WIDGET_EDEFAULT.equals(widget);
			case BasicPackageImpl.PART__RENDERER:
				return RENDERER_EDEFAULT == null ? renderer != null : !RENDERER_EDEFAULT.equals(renderer);
			case BasicPackageImpl.PART__TO_BE_RENDERED:
				return toBeRendered != TO_BE_RENDERED_EDEFAULT;
			case BasicPackageImpl.PART__ON_TOP:
				return onTop != ON_TOP_EDEFAULT;
			case BasicPackageImpl.PART__VISIBLE:
				return visible != VISIBLE_EDEFAULT;
			case BasicPackageImpl.PART__PARENT:
				return getParent() != null;
			case BasicPackageImpl.PART__CONTAINER_DATA:
				return CONTAINER_DATA_EDEFAULT == null ? containerData != null : !CONTAINER_DATA_EDEFAULT.equals(containerData);
			case BasicPackageImpl.PART__CUR_SHARED_REF:
				return curSharedRef != null;
			case BasicPackageImpl.PART__VISIBLE_WHEN:
				return visibleWhen != null;
			case BasicPackageImpl.PART__ACCESSIBILITY_PHRASE:
				return ACCESSIBILITY_PHRASE_EDEFAULT == null ? accessibilityPhrase != null : !ACCESSIBILITY_PHRASE_EDEFAULT.equals(accessibilityPhrase);
			case BasicPackageImpl.PART__LABEL: