localization clarification

fixes #20382

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -573,7 +573,7 @@ export class DebugService implements debug.IDebugService {
 					const compound = typeof configurationOrName === 'string' ? this.configurationManager.getCompound(configurationOrName) : null;
 					if (compound) {
 						if (!compound.configurations) {
-							return TPromise.wrapError(new Error(nls.localize({ key: 'compoundMustHaveConfigurations', comment: ['compound indicates a "compounds" configuration item'] },
+							return TPromise.wrapError(new Error(nls.localize({ key: 'compoundMustHaveConfigurations', comment: ['compound indicates a "compounds" configuration item', '"configurations" is an attribute and should not be localized'] },
 								"Compound must have \"configurations\" attribute set in order to start multiple configurations.")));
 						}