Notifications: How to apply custom product variant (color) no notification?

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Hi everyone!

I am stuck with notification template customization...

Since I wanted to show product color codes in Japanese, I've edited swatch.liquid.

Now, shop frontend is showing the product color in Japanese properly as I hoped. 

However, when it comes to notification templates, they still uses original variant values that are in English. 

I've been struggling with this all day...

Can someone direct me to the right way to apply custom color codes to notification templates so I can show them in Japanese as consistent as the shop please?