Hi,
First, I will see how the language file of the plugin is not loaded.
About the future date and today. You have to enter a value for the option "waiting days".
It is an option to add days (or remove days) for the selection (in past or future).
To remove the default date, you have to remove the "required", clear the default and re-put the require.
This "required" option is generating the side effect. We will see how we can remove it only in the configuration panel.
If you use the option "default today", the date picker will choose today as default value (and will override the date you will configure as default value). When the "waiting days" are configure, the date picker will process the new default value it has to display.
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.