Chain items are now called Chainmail

It seems that item names have been adjusted to match the Java version in this version,

which has resulted in strange item names, such as Chain XX becoming Chainmail XX

Please fix it to normal as soon as possible

(I talk about the 1.21.30 update in this video URL: https://youtu.be/H-ojAnCFzOE?si=fM3z5biF3xvtUZR9)