Angular-locale_en.js not found

In content_views I get this error from the network tab:
/javascripts/bastion/angular-i18n/angular-locale_en.js not found (404)

Expected outcome:
Javascript locale file should be available.

Foreman and Proxy versions:
Foreman 1.20.3

Foreman and Proxy plugin versions:
Katello 3.10

Distribution and version:
CentOS 7.7.1908

This is Bug #25114: getting 404 for /javascripts/bastion/angular-i18n/angular-locale_en.js on content hosts details page on reload - Katello - Foreman that was resolved in Katello 3.12.
As a side note, Foreman 1.20.3 is no longer supported and you should look into upgrading into a supported version (1.22.2 or newer right now).

Thanks for your answer. We’re going to upgrade step by step at the moment because of the big environment here.