Hi,
The "yes/no" is displayed thanks to the "select.booleanlist" JHTML provided by the Joomla framework.
Any front-end component which will use it will have the same "content".
So I don't see the interest of modifying how HikaShop (and HikaMarket) is displaying the "yes/no" if it already using Joomla framework to have an unified content.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.