src/vs/workbench/contrib/notebook/browser/view/cellParts/foldedCellHint.ts/FoldedCellHint/getHiddenCellsLabel
class FoldedCellHint:	private getHiddenCellsLabel(num: number): HTMLElement {
		const label = num === 1 ?
			localize('hiddenCellsLabel', "1 cell hidden") :
			localize('hiddenCellsLabelPlural', "{0} cells hidden", num);

		return DOM.$('span.notebook-folded-hint-label', undefined, label);
	}