React-joyride: Why string concatenation is used instead of doing it in JSX way? why? why?

[ppandatw]

Apart from this line everything of 'locale' object can be a react node. Can you please use _span_ or something for concatenation?
Also update the type of 'locale's fields to React.Node from string.
https://github.com/gilbarbara/react-joyride/blob/72fae22b81b73784efdf5c8ee85968b9ddac0454/src/components/Tooltip/Container.js#L33

[gilbarbara]

¯_(ツ)_/¯