This section displays previous versions of the translation, who made the changes, and when the changes were made. You can enter Phrase History, by clicking on “Phrase History” in the upper left corner of the translator interface.
The crossed out red text shows what words have been deleted, while the green text shows what words have been added.
The 
copy paste button on the right side of each history row allows you to copy the version of the translation, without any of the red or green text.
