ECA Render: translate all renderable strings

This is postponed until 📌 Config validation for ECA models Active is implemented. That way, we will be able to mark config properties as translatable which is required by the potx extraction and in code, we will be able to tag those config fields accordingly so that the usage of those values can be handled by a trait to translate them before usage.

Now that 🌱 [META] Implement complete coverage of validatable config schema across plugins and entities Active and all related issues have been completed, we can get back to this one.

I wonder if config translation wouldn't already provide everything we need. Let's give that a try.