This is another in the series of "wanted" posters that can be found within a campaign setting.
-Even if no one in the party does not speak elvish, they may have come across an NPC who does, or they may go out and seek to find an elf.
-Why is someone looking for a translator? Perhaps he has an elvish document that leads to an ancient ruin ripe for plundering (for which he will need a group of adventurers). Perhaps he has captured an elf and needs to pry some secret knowledge from the elf. Either way, this will doubtlessly lead to further adventures.