src/vs/base/browser/ui/button/button.ts/Button/label
class Button:	set label(value: string) {
		this._element.classList.add('monaco-text-button');
		if (this.options.supportIcons) {
			reset(this._element, ...renderLabelWithIcons(value));
		} else {
			this._element.textContent = value;
		}
		if (typeof this.options.title === 'string') {
			this._element.title = this.options.title;
		} else if (this.options.title) {
			this._element.title = value;
		}
	}