V15: Check if language has changed when updating domains

[Zeegaan]

Notes

• Fixes issue found by @nhudinh0309, where you could not change the language on a domain.
• This happen because we did not change if the language changed, only if the domain name changed, this PR remedies that.

How to test

• Create another language, so that you have at least 2
• Create a content type with allow as root set to true
• Create some content with that type
• On the document, go to culture and hostnames, and create 2 of the English language, for example /en/test & /en/testtwo
• Now try switching on of them to another language, this should now work 🙌

[kjac]

Works like a charm 💪