IndexTag substitute name with character '('

[baymike]

I use the IndexTag substitution to show index names in German.
With Minimserver 2.0.18 update 199, MinimServer comes up with an error message saying:

Unexpected '(' in indexTags value

My setup for IndexTag had values like

• Composer:Komponist (Klassik)
• Group:Komposition (Klassik)
  

This IndexTag formatting still worked with update 197 used before. In the changelog and documentation I could not find anything that brackets would not be allowed.
However, just a minor issue for me, as I can replace brackets with another character.