Hmm, ok but this is not the way it should be.
In your case, the translated string is not faithful to the key (a space is added for no obvious reason).

I would recommend not adding extra spaces to the key, but including an extra space in the code.
Something like this:
```
title: tr("Files downloaded by the user") + " " +
```
with the translation dictionary:
```
"Files downloaded by the user": "Fichiers téléchargés par l'utilisateur",
```