It is beautifully described in the docs how to translate static text using translation files.
As the client has no access to that file and managing a php array is not what I want them to do, I am looking for a way to make edits to the translation file feasible directly in the Control Panel.
This would allow me to set things up in the template and then hand off the actual translation work to someone else.
Yes, you probably have to write a plugin for that. But can you edit the files from a plugin? Is there any API or service available that might help?