Very simple fix for non English languages that sometimes result in a bit longer texts than anticipated by the designers of the default UI layout. This AddOn makes all tooltips a little wider, so they stay within the screen. Arguably, I think it's also easier to read. See screenshots for comparison.

All credits go to votan73 who posted this solution in the official forums.

When comparing an item to two other items (e.g. rings) the tooltips would be too wide for most screens. Therefor, comparison tooltips are shrunk down by 15%. You can change all of if this in the lua file and adapt it to your screen resolution.

If you're looking for a more sophisticated AddOn with ingame settings, please have a look at FCO ChangeStuff.