Hi,
If you re-install HikaShop (using the same package), it will use the language file to re-generate the Joomla system language file used for the menus item names.
Because you installed your language file "manually", the Joomla system language file in has not been generated for your language (but should exist for the english language).
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.