11921: Update CultureName after language change

[BElluu]

Prerequisites

• I have added steps to test this contribution in the description below

I implement fix to this issue #11921 . After fix, notification display correct language name :)

Description

After changing the language option "swedish" to "dutch" it does use the dutch language for the pages but when you publish a page the notification popup at the bottom says "Content published: Swedish (Sweden) published and visible on the website" whilst it should be referring to "dutch (netherlands)".

Steps to reproduce:

1. Change the swedish language option to Dutch (netherlands) and save.
2. Publish a page in the changed language.

[umbrabot]

Hi there @BElluu, thank you for this contribution! 👍

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[mikecp]

Thanks @BElluu for this PR, it works all good 👍
The confirmation message will be less confusing now, which is always good 😁

And since this is your first contribution to Umbraco, @nul800sebastiaan will gladly assign you a shiny contributor badge 🎉

Thanks again and I'm looking forward to reviewing your next contribution!