Missing translation key

[Zasa-san]

Describe the bug It seems that there are cases where we don't have a translation key. This is not crashing the application. Currently this is happening with relationship properties that point to another entity. The sidepanel throws an error saying that it cannot translate since the context is undefined, which makes sense since it's trying to translate the name of an entity.

To Reproduce Steps to reproduce the behavior: An example of the error can be seen on this demo entity https://demo.uwazi.io/en/entity/iaec5e80hps

Additional context See linked Sentry issue @konzz believes that #6577 could be linked to this.