Translation of Custom App not Working

I have developed a custom app for which I would like to add custom translation.
I added translation folder to the app dir and added en.csv to it.
In the csv I have written something like this:

DocType: Logistics Import,Purchase Order No,Test
,Purchase Order No,Test

But it just won’t translate.
image

Any ideas?

//EDIT
It works for other languages like de, but not for en

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I’m facing the same issue. It looks like en.csv doesn’t get used. I’m wondering why not?

It works if I do the translation for en using the Translation doctype in the frontend.

In my opinion it should also work with a translation file named en.csv

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This seems to have been broken for a while: