Fix lib for anonomous users

Full Changelog: 1.4.0...1.5.0

Ignore missing rootUrl

Full Changelog: 1.3.0...1.4.0

Propagate query params for page urls

Full Changelog: 1.2.0...1.3.0

Add `getLanguageLinksForHead()` to generate head html

Adding a function that will return page metadata with the location of translations for a page that can be added using pageContributions.

Allow url be undefined when translation is missing

This is more useful, and we can use rootUrl instead of we want to to the root page.

Create translations library

This library has one function getTranslations() which returns URLs to all translated versions of a Content.