Determines the text of the link created by the eventLimit setting.
String, Function. default:
If a string is specified, the resulting text will be prepended with the number of events being obscured, like “+2”, resulting in something like “+2 more”.
If a function is specified, the function will be given a single argument, the number of events being obscured, and must return the final text string to be used.
The default value of this option is affected by the current locale.