Hi,
You do not require to edit the preload file to add simple translated texts.
If the text key is not found in the prelod file, HikaShop will use the a simple translation. So it will use the text you put in your language override.
The text puts in the preload file are more text with some variables, like "Hi <customer name>" where the custom name is displayed.
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.