[Selections] Document working of selections plugin loaded by resource bundles in site applications

The following page explains how the selections plugins are configured and implemented for site applications

https://documentation.bloomreach.com/library/concepts/plugins/selections/delivery-tier.html

When we switch to resource bundles instead of value list documents, it needs to be verified how the developer deals with the label and keys coming from resource bundles. The following page has an example of implementing resource bundles in a jsp file.

https://documentation.bloomreach.com/library/concepts/plugins/resource-bundle-editor/usage-in-an-hst-site.html