To change or translate the product variant trigger name, please follow these steps:
Step 1: Change the name of variant options in admin
From your admin, click to Product
Select the product you want to change and scroll down to Variants section
Setup the name of variant as you expect.
After above step, all variants name will be change perfectly in Product detail except Color option because we are using name "Color" to trigger in code. So you need to move to step 2 below to finish this setup for color option
Step 2: Change variant trigger name
From you admin, customize your current Umino theme
Click to Theme setting icon, select Product and scroll down to Option name
Insert the name to the input. This name must be the same with the name of Color variant that you changed in step 1
Save and you can see the result.