Describe the issue:
Have tried adding the custom localization to authentication endpoint by following the doc [1] but in IS 7.0.0 pack it is not working as expected. It will only resolve the supported locale combinations in [2]. With this implementation, the customizations are not working and the locale will be fall back to en_US if there is a not supported locale is requested.

[1] https://is.docs.wso2.com/en/latest/references/extend/localization-support-in-identity-server/
[2] https://github.com/wso2/identity-apps/blob/1f49cc39fb58cf208e7d2d79165f72dd5c1b85ef/identity-apps-core/apps/authentication-portal/src/main/webapp/includes/localize.jsp#L40

How to reproduce:

• Steps can be found in [1]

[1] https://is.docs.wso2.com/en/latest/references/extend/localization-support-in-identity-server/#configure-localization-for-authentication-endpoints

Expected behavior:

• Should be able to support the custom localizations.

Environment information (Please complete the following information; remove any unnecessary fields) :

• Product Version: wso2is-7.0.0-beta7-SNAPSHOT
• OS: Mac
• Database: H2
• Userstore: JDBC

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