Hello,
You have to activate the Joomla language debug mode.
Then you will see a report in your page about the language and the translations ; you will also have information regarding the errors in your language file;
Because if there are errors, Joomla won't be able to use the file content.
Please understand that the translation features are not managed by HikaMarket or HikaShop but by the Joomla core itself.
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.