In the ufopedia when mousing over terms specific to this mod that you don't remember what means
(If I understand correctly what you mean) that would be serious development effort and modding effort too.
I don't think any modder would want to mark individual words and bind them to various tooltips... not to mention multi-language support.
or what the debuff icons in the equipment screen means...
All buttons on equipment screen (soldier inventory screen) already have tooltips, no?
(just below the right leg slot)
...or in the battlescape if you forget what the number for weapons that are two-handed means.
Ehm... "2" means "2-handed", lack of "2" means "not 2-handed"?
I don't think you need a tooltip for that...