The transliteration data shipped with Drupal core romanizes CJK ideographs with their Chinese (pinyin) readings, so machine names and URL aliases generated from Japanese text come out wrong — 日本語 becomes "ribenyu" instead of "nihongo". Japanese Transliteration adds a Japanese-aware layer to Drupal's core transliteration service so that machine names, file names and URL aliases are romanized the way they actually read in Japanese.
Layout Builder Block Presets lets site builders save configured Layout Builder blocks as reusable presets, and quickly insert those presets into other Layout Builder sections/pages.