Incorrect Icon translation on course search

[igobranco]

When a course page has an Icon (Category), but a single translation, example the course has only text on Portuguese but not on English.
On course search screen the Icon shows only on Portuguese.
Even that Icon (Category) is published on both Portuguese and English.

This bug only happens on course glimpse (cover) on react implementation, but not on the django based implementation.

To mitigate this situation what can be done, is to publish an almost empty translation for the course that includes just the same Icon (Category).

Upstream issue: openfun/richie#2559