The wiki contains a lot of screenshots dating back to the KDE 4 era and some are even from the KDE 3 era. But up-to-date screenshots are also quite important, because when the user see the old screenshots, he can think that the instructions are also outdated. Then for each wiki entry, you only need to download the software, find all outdated screenshots in the wiki entry, take a new screenshot for each old screenshot, and upload the new screenshot.