I think you should add more information here. Are you using ubuntu? what version? If not, how did you install LÖVE? Which version of LÖVE do you have? Is your keyboard special in any way?. That kind of thing.
You probably don't mean "literal", rather something else; the most important question would be what layout are you using, something other then US-english?
Because iirc in 0.9.x, keycodes for non-us keyboard keys like accented ones and the like won't map to anything because SDL keycodes are only for those; everything else is mapped to unknown.
In 0.10, you'll be able to use scancodes instead, which usually correspond to the mechanical layout, so pressing á (on a hungarian keyboard, for example) will hopefully register as the scancode for " ' ", if i remember correctly.
Me and my stuff True Neutral Aspirant. Why, yes, i do indeed enjoy sarcastically correcting others when they make the most blatant of spelling mistakes. No bullying or trolling the innocent tho.