What does the Scrabble board look like in foreign languages?
The board is the same shape in every language as far as I know

What changes are letters and letter distributions:
https://en.wikipedia.org/wiki/Scrabble_letter_distributions

Welsh is a notable one:



Edit: A 21x21 board apparently exists and seems to be a licensed variant of the game: https://en.wikipedia.org/wiki/Super_Scrabble


Credit: Kevin Marks from San Jose, USA - Super Scrabble, CC BY 2.0