show 'edited' label when message is edited by user #638
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showing 'edited' below message because ->
message and continuous messages have different UI, so the text cannot be in the header with the avatar and time.
Also, not showing it alongside the text, because messages can be long and the 'edited' tag may move towards the end of window.
Also, if link messages are updated we want to show the 'edited' tag below the link preview, so users can know the generated preview may be an updated one.