There is a issue Leaflet/Leaflet#6208 where the ' is not correct parsed, the regex have to be changed:

Doc

@option zoomOutText: String = '−'

Regex:

\s*(?:)@(?:)((?:)\S+)(?:)(?:\s+(?:)((?:)[^;\n]+)){0,1}

When the ; is removed it works.

I tried do change it and select until the exact match ;\n with or without ; but the regex is to complicated for me.