In the email templates there is button "Add attachment to templates", but it should be "Add attachments to template", i.e. plural form is in a wrong place. Also I guess this is what makes the string untranslatable.

When clicking it opens "Select attachement", should be "Select attachments" (or "attachment", but at least there is a typo).

Also how can one translate that and "To add files please open the resources tab, or ask an administrator to add files to the survey folder"? The code says _vm._f("translate")("Select attachement"))..., but the string is missing from somewhere, a .po file maybe.