Helpers in Models

I have an app that relies on a series of helpers to generate language
specific text strings for all output.

In one of my models I have to save one of these language specific
strings to the table.
Therefore I've started investigating how I can accesss my helpers in my
model - I know this is not best practise, but its the only way I can see
to make this work.

I know of the solution with including the helper in the model like this:

class Employee < ActiveRecord::Base
   include LanguageHelper

But this is not that good performance wise?

How do I reach my helpers in the model in a more efficient way?
Or can I construct my code in a more correct way?

Best regards