fix(message): disable save on empty message

[jasonwoodland]

What this PR does 📖

• Prevents saving an edited message as an empty message
• Fixes styling and locale strings in the edit message UI

Which issue(s) this PR fixes 🔨
AP-1631

Special notes for reviewers 🗒️

Additional comments 🎤

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[josephmcg]

I like the solution. Could you remove $data and $props mentions and fix intellisense in the file? The computed need return types. Then you can remove the declaration stuff (screenshot below).

Please make a habit of fixing this whenever you see it

[stavares843]

Gravacao.do.ecra.2022-05-31.as.02.06.29.mov

if you try to save a empty message doesn't return any feedback to the user when clicking on save

[josephmcg]

true. error toast would be enough.
a nice bonus feature would be making the blue outline red if error, that would be fairly involved though