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
case BasicPackageImpl.PART__VARIABLES: return UiPackageImpl.CONTEXT__VARIABLES;
				case BasicPackageImpl.PART__PROPERTIES: return UiPackageImpl.CONTEXT__PROPERTIES;
				default: return -1;
			}
		}
		if (baseClass == MUIElement.class) {
			switch (derivedFeatureID) {
				case BasicPackageImpl.PART__WIDGET: return UiPackageImpl.UI_ELEMENT__WIDGET;
				case BasicPackageImpl.PART__RENDERER: return UiPackageImpl.UI_ELEMENT__RENDERER;
				case BasicPackageImpl.PART__TO_BE_RENDERED: return UiPackageImpl.UI_ELEMENT__TO_BE_RENDERED;
				case BasicPackageImpl.PART__ON_TOP: return UiPackageImpl.UI_ELEMENT__ON_TOP;
				case BasicPackageImpl.PART__VISIBLE: return UiPackageImpl.UI_ELEMENT__VISIBLE;
				case BasicPackageImpl.PART__PARENT: return UiPackageImpl.UI_ELEMENT__PARENT;
				case BasicPackageImpl.PART__CONTAINER_DATA: return UiPackageImpl.UI_ELEMENT__CONTAINER_DATA;
				case BasicPackageImpl.PART__CUR_SHARED_REF: return UiPackageImpl.UI_ELEMENT__CUR_SHARED_REF;
				case BasicPackageImpl.PART__VISIBLE_WHEN: return UiPackageImpl.UI_ELEMENT__VISIBLE_WHEN;
				case BasicPackageImpl.PART__ACCESSIBILITY_PHRASE: return UiPackageImpl.UI_ELEMENT__ACCESSIBILITY_PHRASE;
				default: return -1;
			}
		}
		if (baseClass == MPartSashContainerElement.class) {
			switch (derivedFeatureID) {
				default: return -1;
			}
		}
		if (baseClass == MUILabel.class) {
			switch (derivedFeatureID) {
				case BasicPackageImpl.PART__LABEL: return UiPackageImpl.UI_LABEL__LABEL;
				case BasicPackageImpl.PART__ICON_URI: return UiPackageImpl.UI_LABEL__ICON_URI;
				case BasicPackageImpl.PART__TOOLTIP: return UiPackageImpl.UI_LABEL__TOOLTIP;