Control spacing before separator

[simonleadbetter]

For improved a11y, we prefer to use a comma as a separator than the default | pipe character as screen readers will read vertical line, but they will ignore punctuation like a comma.

We change the default separator using the separatorChar config override; however, this leaves a space between the title and the comma. It would be great if the value of the separator honoured spacing, i.e: ', ' rather than it be programatically added.