Follow-up from "Improve error display for Zentao issue page"

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The following discussion from !88035 (merged) should be addressed:

• @justin_ho started a discussion: (+1 comment)

  Thought (non-blocking): It's a bit inefficient that we have to fetch the issue twice (once when rendering the HAML view and once after the frontend request) and this is only used for the breadcrumbs / page title. Not sure if the backend somehow caches this but either way it would be much better if there was a way to only make the request once (preferably keep the frontend one).

  Maybe a sort of utility function to set the breadcrumbs / page title from Vue which can be set later on. We can create a follow-up issue to think about it more.