Hey Ralf,
Yes, it's all in the language file of the plugin. No, actually it's part of the default langauge file:

COM_CMC_NEWSLETTER_DATA="Newsletter Informations"

COM_CMC_NEWSLETTER_INTERESTS="Newsletter Interests"

Just create template overrides and you should be gooooood to go

Cheers,
Daniel

Hi Daniel,

Thanks that worked really well!

Just one more question: when I tried to search for the constants in the Joomla Language Manager by value using the values "Newsletter Informations" and "Newsletter Interests" no search results were returned. Is this normal and if so is there a list anywhere else of the possible language constants for the component?

Thanks