Add kanjidic data + update script

kanjidic2/version.txt

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+2026-04-07.2026-097.4

scripts/update-kanjidic2.sh

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+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p coreutils curl gitMinimal gzip gnugrep gnused xmlformat
+
+set -euo pipefail
+set -x
+
+URL='https://www.edrdg.org/kanjidic/kanjidic2.xml.gz'
+TMP="$(mktemp -d)"
+
+PROJECT_ROOT="$(git rev-parse --show-toplevel)"
+DATA_DIR="$PROJECT_ROOT/kanjidic2"
+
+function cleanup {
+  rm -rf "$TMP"
+}
+trap cleanup EXIT
+
+curl -L -o "$TMP/kanjidic2.xml.gz" "$URL"
+gzip -dkc "$TMP/kanjidic2.xml.gz" > "$TMP/kanjidic2.xml"
+xmlformat "$TMP/kanjidic2.xml" > "$TMP/kanjidic2_formatted.xml"
+mv "$TMP/kanjidic2_formatted.xml" "$DATA_DIR/kanjidic2.xml"
+
+FILE_VERSION="$(\
+  head -n 1000 "$DATA_DIR/kanjidic2.xml" \
+  | grep -Eo '<file_version>[0-9]+</file_version>' \
+  | sed 's|</\?file_version>||g' \
+)"
+
+DB_VERSION="$(\
+  head -n 1000 "$DATA_DIR/kanjidic2.xml" \
+  | grep -Eo '<database_version>[0-9-]+</database_version>' \
+  | sed 's|</\?database_version>||g' \
+)"
+
+CREATION_DATE="$(\
+  head -n 1000 "$DATA_DIR/kanjidic2.xml" \
+  | grep -Eo '<date_of_creation>[0-9-]+</date_of_creation>' \
+  | sed 's|</\?date_of_creation>||g' \
+)"
+
+echo "$CREATION_DATE.$DB_VERSION.$FILE_VERSION" > "$DATA_DIR/version.txt"
+
+cleanup