Add instructions to configure localization for authentication and recovery endpoints

[AfraHussaindeen]

Purpose

• $Subject
• Related issue : Custom localization is not working properly product-is#19529
• Documentation Content: Extracted and modified from the https://is.docs.wso2.com/en/5.11.0/develop/localization-support-in-identity-server.
• Reference Image: Refer to the following image for the updated documentation content view.

• To be merged after : Add localization support for authentication and recovery endpoints identity-apps#6406

[himeshsiriwardana]

Also, please explain what interfaces are affected by these changes in Layman's terms. (for both endpoints).