No, this does not fix the problem. Now all letters are small, but we need the correct grammer form: Was die BFW Ihnen bietet.
It depends on noun, verb, adjective etc.
You do not need CSS to fix this, you just need to enter the correct tab text in the page editor. You can edit the text to be anything you need, please edit the tabbed shortcode and add your new text “Was die BFW Ihnen bietet”.
I’m having this same issue. Entering capital letters within Accordion section titles get converted to lowercase. I don’t mean stylistically – the actual content is converted by the system in the admin area as lowercase. I have temporarily fixed this for the front end view with css but this is kludgy. Please fix this in the next theme release. I’m using version 3.17. Thanks.