We also don't want the uppercase for tabs (because we use uppercase for our grid titles), for now we changed this in CSS but this idea would work better.

CSS code:

.MuiTab-root .title {
  text-transform: capitalize !important;
}

The capital font is based on the Material UI standard we follow:

https://mui.com/material-ui/react-tabs/

I see that Peter has shown a work around already, thank you @PeterKeeris. 

As a customer I don't want to follow that standard. And sorry, tried the CSS, but does not work. Still capitals 

I also would like to have the translation shown as intended and not forced to be fully uppercased, Some translations are purposely made upper-/lowercase or a combination.

Please make it an “Extended property” to have an option if you want to abide translation format or have it all uppercased for tabs.

FYI: discussed with @Bart Metselaar and with the Universal team. We agree with this change and I have added it to the Universal GUI Forecast. Most likely we'll get to it during the next Sprint.