Arguably you could make that a variant of Bestow Curse.
Forcing them to make a Linguistics Check equal to the Save DC of the spell each time they look at characters in order to see if they appear normally or they can decipher them might be easier to get by a GM as a 3rd level spell, though.
Converted from 2e
Level: Alchemist 1, Bard 1, Psychic 1, Shaman 1, Sor/Wiz 1, witch 1
Casting time: 1 standard action
Components: V, S, M (a pinch of soot)
Target: 1 creature or piece of writing
duration: 10 minutes/level
Saving throw: special (Will negates or none)
Spell Resistance: yes
You render one creature unable to understand spoken or written language. The target is allowed a saving throw to resist this effect. Alternatively, you render one inscription incomprehensible. This effect allows no saving throw.
Related to this, there is babble, the reverse form of tongues, which renders all speech incomprehensible in an area.
1e/2e: for all your 3.x needs.
There's no obvious way to remove that though. Maybe via remove curse, or dispel magic? It doesn't say.
And you need to specify whether the target can read a scroll or other non-linguistic inscription.
I assume these two posts were addressed to me.
1. There is a duration and it's a magical effect, so it stands to reason that can be removed by anything that can remove magic will work. Not to mention that it's a reverse form, so it cancels and is canceled by Comprehend Languages. Most spells do not bother to say they can be removed by Dispel Magic, and ones that can specifically be removed by other spells like Remove Curse or Break Enchantment tend to state this.
2. a) By 'scroll' I assume you mean a spell scroll. Depends on if you count spell scrolls as being based on language. If so, then you can't read them.
b) Non-linguistic inscriptions are, as you say, not languages, so the spell that confuses languages would probably not work on them.