mod_http_oauth2: Validate (unused at this point) localized URIs Client registration may include keys of the form "some_uri#lang-code" pointing to alternate language versions of the various URIs. We don't use this yet but the same validation should apply.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```