Translation Missing: New Contact field

[Limes]

Hey Guys, 

I added in some code to put into an additional Subject Line text field in my contact form - but it's coming up as Translation Missing as shown in the image. 

I've gone into the "edit default theme content" section to try and find the missing translation or add a new translation link in but I couldn't find anything / know how to do this. 

Could someone help me out? 

[fadi_yousif · Accepted solution]

Add the translation in locales/en.default.json. Use Ctrl+F or Cmd+F on macOS, type in "form": { (including the quotes) and hit enter. That's where you need to add the "subject" key-value pair.

[Limes]

Legend it works thanks Fadi

One additional question I did a test contact form run and I get this label (New customer message on %{creation_date}:) for where the subject line should be: 

Any idea where the code is to change that?