• Allows the translator to select a change diff from a source language and view it while editing a translation.
• Task priority above average as it is a stepping stone to other features.

Detailed subtasks

• Extract the compare code setup from tiki-pagehistory to a shared location.
• Extract the diff display portion from the template to a template include.
• Add a translation list and a translate link to point to the edit page with the appropriate translation source parameters.
• Display the source diff on edit page.