Can you try installing a plugin such as Theme Test Drive and using that to switch the theme to one of the default themes (twentyfourteen for example), using theme test drive allows you to test the theme as an admin but leave the site in its current state.
Then try editing the messages once again, are you now able to?
Just to confirm are you using the latest version of EE4 (currently 4.2.6.p)
Thank you! It was a conflict with the contact form plugin
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