FR: Allow twig code in entry URL formats for better translations

[TomDeSmet]

Description

Most of the times when creating a multi-lingual website, we have one single (eg. Product page) and one Channel (eg. Products).
The Product page single is the page that has the Twig template where all entries from the channel Products are listed. We link to this single and not just directly to a template because we want to have the translated slugs that a single section provides and at the same time, we use the title field to provide the translations for that page.

The problem is that there is no link between that single and the channel that populates its data. It would be great if we could have the entry URL format of the channel template translated by using twig code such as { craft.entries.section("productPage").first().title } instead of having to manualy type over the same name as in the single. For the moment we can only use { attributes } from the entries themselves and in singles we can't use anything, not even the title field of the single entry.

That is an issue when adding new languages or when the client changes the title of the section. The entry URL format of the channel pages need to be edited manually.

Something like the functionality of the LJ Dynamic Field plugin would be nice here.