Currently, external links displayed in the sidebar of entity page are created using subroutine sidebar_name defined in Perl under lib/MusicBrainz/Server/Entity/URL/.

• It is a minor breach of MVC pattern as it should belong to the View component under root/.
• A bit more annoying, it prevents implementing smart/conditional display of external links in the sidebar because neither the entity it is linked to nor the relationship type it is linked through are provided when computing sidebar_name.

Since relationship type and related entity are already available to the component ExternalLinks in React under root/layout/components/ExternalLinks.js, it seems easier to follow MVC pattern by moving the computation of sidebar_name from Perl to JavaScript, thus allowing for improvements of external links' sidebar display.