Many wikis have different language counterparts, could a script be developed so that people may see the name of the different language wiki. For example when an English user seeing 'Русский' hovers over that word they would see 'Russian' in the tooltip, and a Italian user hovering on 'English' would see a tooltip saying 'Inglese'.
Whether used on a few wikis or across every one it's a neat and informative feature to develop. At the same time flags that some wikis use to represent languages can be phased out which should help make things easier since it just involves text.
Two excellent advancements to be made!