Allow regenerating metadata if the result is not satisfactory without generating a new text first

[webhoeck]

Generating metadata for a given text will yield a different result every time (depending on the configured temperature).
As a user, I would expect to have the option to regenerate the result if it is not satisfactory.

Currently, this is only possible by first submitting the text again. Afterwards, I can generate the metadata again to get a different result.
It would be great to just have a button to regenerate metadata without regenerating the whole text, leading also to more clicks.