Title Case —> Sentence case

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

These should be in sentence case

• App tabs
• "NewPipe Website" —> "NewPipe website" in About & FAQ
  Maybe more

Why do you want this feature?

Use sentence case

Unless otherwise specified, use sentence-style capitalization, where only the first letter of the first word in a sentence or phrase is capitalized. All text, including titles, headings, labels, menu items, navigation components, app bars, and buttons should use sentence-style capitalization.

Products and branded terms may also be capitalized.
https://m3.material.io/foundations/content-design/style-guide/ux-writing-best-practices

Additional information

No response