Bug: invisible error

Summary

1. Fix for https://gitlab.com/caosdb/caosdb-webui/-/issues/207 Related issue: #316 (closed)

2. Unrelated: I notices that the "E" for "Entity" was not visible either and added a css rule for that as well.

Focus

There was a

Test Environment

Manual Testing:

1. Request an entity which does not exist, e.g. https://localhost:10443/Entity/asdf
2. Do the steps from https://gitlab.com/caosdb/caosdb-webui/-/issues/207
3. Try and delete an entity which is required by other entities

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