at least I can not reproduce that for 8

I performed a test with 7.6.10 and 2 languages and I obtained that, when translating the form, the bodytext (which is "configuration") has been prepended with "[]" e.g.

Original (default) language:

class = cicciform
title = cecciform
enctype = multipart/form-data
method = post
prefix = tx_form
confirmation = 1
postProcessor {
    1 = mail
    1 {
        recipientEmail = 
        senderEmail = 
    }
...

Translated:

[]class = cicciform
title = cecciform
enctype = multipart/form-data
method = post
prefix = tx_form
confirmation = 1
postProcessor {
    1 = mail
    1 {
        recipientEmail = 
        senderEmail = 
    }
...

Update¶

As I wrote on my issue #68272, the "[]" will be prepended if you type something in the header field; if this is empty, the bodytext will be prepended with "[translate to English]"