Add a function to check if target_word contains CJK characters
If a search term contains Chinese, Japanese, or Korean characters,
the term is bolded in search results regardless of whitespace.
CJK characters: Chinese, Japanese (hiragana, katakana, kanji),
and Korean (hangul syllables, hangul jamo)
Co-authored-by: Ben Busby <contact@benbusby.com>
e5a5aad997