Request to support for non-ISO locales as JcrResourceBundleProvider does not support non-ISO locales OOTB

[#1]

Request for Feature Enhancement (RFE) Summary:	On our application, due to member firms structure, non-ISO locale are used (e.g. DE-DL Germany Legal). OOTB  "JcrResourceBundleProvider" implementation doesn't recognize non-ISO code and returns the default value instead of locale specific translated value. A support ticket was created [1] and got a confirmation that non-ISO codes are not supported. I am raising this enhancement request to recognize the non-ISO locales as there many sites with this format. [1] https://experienceleague.adobe.com/home?lang=en&support-tab=my-cases&case-id=E-001650678&org-id=BEAD...
Use-case:	Same as above
Current/Experienced Behavior:	non-ISO locales are not recognized by i18n (JcrResourceBundleProvider), due to this expected translated value is not returned
Improved/Expected Behavior:	expectation is to get the value of non-ISO locales
Environment Details (AEM version/service pack, any other specifics if applicable):	AEMaaCS v19149
Customer-name/Organization name:	Deloitte
Screenshot (if applicable):
Code package (if applicable):