That is stunningly easy with TypoScript, it’s even possible to prevent the prepend of “[Translate to english]” text on the headline:
//for pages
TCEMAIN.table.pages {
disablePrependAtCopy = 1 //the [Translate to XXX] text
disableHideAtCopy = 1 //hidden
}
//for content elements
TCEMAIN.table.tt_content {
disablePrependAtCopy = 1
disableHideAtCopy = 1
}