Updated examples to ensure tests are case insensitive in valid lang tag rules

[carlosapaduarte]

…subtag are done in a case insensitive manner

Closes issue(s):

• closes Add test case with different capitalization in valid language tag rules (de46e4 and bf051a) #1499

Need for Call for Review:
This will require a 1 week Call for Review

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[Jym77]

Not fully sure whether we should instead add new passed example (with appropriate description pointing on case insensitivity).
Mostly because these examples probably already exist for a reason (at least I hope) and that they now have 2 reasons: the old one and the case insensitivity; which we normally frown upon.

[carlosapaduarte]

The definition of valid language tag already includes this:

Subtags, notably the primary language subtag, are case insensitive. Hence comparison with the language subtag registry must be done in a case insensitive way.

Do you really think that we need to have tests exclusively checking this?

Discussed in CG meeting

[WilcoFiers]

@carlosapaduarte can you change the PR title of this, so we end up with a complete message in the changelog?

[carlosapaduarte]

Call for review ends on February 18

[carlosapaduarte]

Call for review ended. Merging