Allow usage of LLL in Templates.yaml

[lorenzulrich]

Feature Request

Is your feature request related to a problem? Please describe.

For international pages with an international editorial team, the backend needs to be fully translated. However, the YAML templates currently don't allow using the LLL: syntax in Templates.yaml and [item].yaml.

Describe the solution you'd like

Currently, the template settings (name, description, previewImage) are passed to the Fluid template as they are. There are several options:

• Pre-process the configurations, detect LLL: syntax and use the LocalizationUtility to resolve labels before passing them to the frontend.
• Use <f:translate key="{template.name}" default="{template.name}" /> in the template to make normal labels an LLL labels work. However, this is not a very clean solution.
• Allow overriding the Fluid templates of the extension so the integrator can provide own templates fitiing the requirements.