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.