renderChangeIndicator(changes) {
			let n_changes = 0;

			for (const config in changes)
				if (changes.hasOwnProperty(config))
					n_changes += changes[config].length;

			this.changes = changes;
			this.setIndicator(n_changes);
		}
Update the change count indicator.

This function updates the UCI change count indicator from the given
UCI changeset structure.

@instance
@memberof LuCI.ui.changes
@param {Object<string, Array<LuCI.uci.ChangeRecord>>} changes
The UCI changeset to count.