Corrected button capitalization throughout the website

What does this MR do?

Corrects the button caplialization throught the website

Are there points in the code the reviewer needs to double check?

Double check casing matches requirements for buttons with registered trademarks CI Lint/CI lint (?)

Why was this MR needed?

To correct the text casing on buttons to conform to the UI Guide

What are the relevant issue numbers?

#18877 (moved) #18931 (closed)

Screenshots (if relevant)

Before: After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

Closes #18931 (closed)