alias honjitsu_no_shuyaku -> birthday_sash

BUR #24077 has been approved by @nonamethanks.

create alias honjitsu_no_shuyaku -> birthday_sash

honjitsu no shuyaku(本日の主役) is a type of sash used in Japan to celebrate birthday.
I created this BUR because I think birthday sash has a more generic meaning, and an English tag would be more intuitive for danbo users.

The bulk update request #24077 (forum #271958) has been approved by @nonamethanks.

The phrase 本日の主役 has appeared in forms other than a sash (post #7218159), should they just stay untagged? Also I would also like a birthday sahsh -> shoulder sash implication, if not for post #7236980. Does unworn shoulder sash count as a shoulder sash? And are there birthday sash that's not a shoulder sash?