fix: correct transliteration rules for Japanese in DefaultSlugGenerator

Author: cklei-carly

src/Content/DefaultSlugGenerator.php

@@ -12,10 +12,11 @@ class DefaultSlugGenerator implements SlugGeneratorInterface
     const LANG_AUTO     = 'auto';
 
     private static $transliterationRules = [
-        self::LANG_CHINESE => 'Han-Latin; Latin-ASCII; Lower()',
-        self::LANG_RUSSIAN => 'Russian-Latin/BGN; Latin-ASCII; Lower()',
-        self::LANG_ARABIC => 'Arabic-Latin; Latin-ASCII; Lower()',
-        self::LANG_JAPANESE => 'Hiragana-Latin; Katakana-Latin; Latin-ASCII; Lower()',
+        self::LANG_CHINESE  => 'Han-Latin; Latin-ASCII; Lower()',
+        self::LANG_RUSSIAN  => 'Russian-Latin/BGN; Latin-ASCII; Lower()',
+        self::LANG_ARABIC   => 'Arabic-Latin; Latin-ASCII; Lower()',
+        // include Han-Latin to transliterate Kanji
+        self::LANG_JAPANESE => 'Han-Latin; Hiragana-Latin; Katakana-Latin; Latin-ASCII; Lower()',
     ];
 
     public function generate($text, $language = self::LANG_AUTO, $separator = '-')