Mustrum_Ridcully
Legend
I think you should add the total skill bonus together. (So it is a +8 bonus equipment). This does also explain the cost of a vest of escape (something like "+4 on open lock and +6 on escape artist").
Since most people won`t know much more than 2 languages, I think counting the literate ability as a futher +2 skill bonus, so it is a total of +10. A 2.000 gp equipment, as I already explained above.
A mundane item would probably somethink like a "dictionary of magic", in which you can look to figure out "what that arcane symbol is supposed to mean". I think it should give a +2 bonus on Use Magic Device Rolls and Spellcraft checks to identify a scroll.
(Not more for a mundane item). Probably it would take more time to use the dictionary, but perhaps you are allowed to read before you use actually want to use the scroll. (The information last in your mind for a number of hours equal to your intelligence score. After that duration, you lose the bonus and have to reread the scroll and the passages in the dictionary. Arcane Magic can be very complicated, and if you don`t have a trained ability to "safe" the spells in your head - read: Spell Slots - you can`t remember to long for it...)
Oh, and you do not always have to rely on items. The Skill Focus Feats gives you a +2 (perhaps even a +3, depending on your master ) to a skill.
Since most people won`t know much more than 2 languages, I think counting the literate ability as a futher +2 skill bonus, so it is a total of +10. A 2.000 gp equipment, as I already explained above.
A mundane item would probably somethink like a "dictionary of magic", in which you can look to figure out "what that arcane symbol is supposed to mean". I think it should give a +2 bonus on Use Magic Device Rolls and Spellcraft checks to identify a scroll.
(Not more for a mundane item). Probably it would take more time to use the dictionary, but perhaps you are allowed to read before you use actually want to use the scroll. (The information last in your mind for a number of hours equal to your intelligence score. After that duration, you lose the bonus and have to reread the scroll and the passages in the dictionary. Arcane Magic can be very complicated, and if you don`t have a trained ability to "safe" the spells in your head - read: Spell Slots - you can`t remember to long for it...)
Oh, and you do not always have to rely on items. The Skill Focus Feats gives you a +2 (perhaps even a +3, depending on your master
) to a skill. 
