When you pass a dict to `.with_context()`, it completely replaces the context, removing the language from it. This causes that when the publisher publishes a slide in another language, the template gets mixed languages rendering. Closes #15017
When you pass a dict to `.with_context()`, it completely replaces the context, removing the language from it. This causes that when the publisher publishes a slide in another language, the template gets mixed languages rendering. Closes #15017