When a translation needs to be updated, the translation extension shows a text that says "This translation may need to be updated. Show differences?" Clicking on the "Show differences" displays something different.
Steps to replicate the issue (include links if applicable):
*When translating this page, in the Finnish or Italian version. this paragraph displays a very old version of the whole page's source code instead of the diff.
The above issue was report by @Kyykaarme at meta-wiki.