Change id of language in database

[redrum]

I have two installed language
English    (id: 1)
Swedish    (id: 2)

I want to change the id on these two language. Like this:
English    (id: 2)
Swedish    (id: 1)

I can see that this should be done in the db table 'ps_lang', under the column 'id_lang'.

But do I need to change something else anywhere in the database, or in any file for that matter?

Thanks

[redrum]

Thanks for your reply and the heads up@ndiaga

I took a brief look in the database and saw that it would be some complications.
I'm in the beginning of a new installation and I have migrated a bunch of customers and orders, and I thought I could take a shortcut. but it probably won't end well

My main issue is that I want to have the BO in English, and FO only in Swedish. That's an easy fix by doing the proper settings in BO.
The problem arise when I want to add or edit a product in BO. When I add/edit a products it is done in the BO-language (which is english), but the FO is set to only show Swedish.

[redrum]

I have inactivated English, and then I don't have the option to switch language when editing a product.
In the product list the Name become "N/A", but when I go to the page for editing a product the product name and description is correct.

Looking at this it just hit me, I think it might have to do with the product import I've made. I think I configure the script so the swedish language id was 1, but the id is actually 2 in the installation that I'm working on now.