Rename “Castling” to “castling rights” in the board editor

[hb20007]

Players familiar with FEN know that there is only one possible interpretation for what the checkboxes mean beside “Castling” on the board editor:

However, I remember being confused about this when I was a total beginner in chess. Is this indicating whether castling is allowed in the position, or whether castling has already happened in the position, meaning that it would not be allowed?

A simple fix to make this more beginner-friendly is to rename “Castling” to “Allowed castling”. I also propose renaming “En passant” to “Allowed en passant” for consistency and to avoid beginners being confused about what this empty dropdown list is for.

[lucasart]

Perhaps "Castling rights" is better (more concise, just as precise)

[Nordlandia]

Castling flags is also a viable alternative.