[5.3] Language Association Codes

[brianteeman]

In the Language Code plugin it is possible to change the code used for a specified language. eg fr-FR can be changed to fr-CA

However everywhhere in the admin that associations are displayed it uses the original code and not the changed code.

This PR is a "takeover" of the original PR #37289 created by @infograf768

That PR has merge conflicts and @infograf768 is now retired.

See the original PR for more screenshots

Testing Instructions

Create a multilingual site.
Enable the languagecode system plugin and give a new lang tag value for a language.

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[fgsw]

I have tested this item ✅ successfully on 8ccef0c

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[Fedik]

The feature maybe is good and usefull.
However the implementation is questionable, because hardcoding if (PluginHelper::isEnabled('system', 'languagecode')) everywhere promisses a loot of fun bugs.

Need to look for a better way of doing the same, maybe some extra event, or kind of that.

[universewrld]

@brianteeman will it work if instead of en-GB i just use en?
in your screenshots it is shown only for language+country codes.

[brianteeman]

@brianteeman will it work if instead of en-GB i just use en? in your screenshots it is shown only for language+country codes.

yes but then then language code wont work as intended.