Bug: «Transaction Type» value on «Sales» → «Transactions» → <transaction> admin screen is untranslatable (and my fix)

«Transaction Type» value on «Sales» → «Transactions» → admin screen is untranslatable:

The problem line is:

To fix the bug replace the line specified with the new one:

$this->setTxnTypeHtml($this->escapeHtml(__($this->_txn->getTxnType())));