@Jagster - you could try something like this:
First remove the existing reply icon
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with custom CSS:
.fa.d-icon.d-icon-reply.svg-icon.svg-node {
display: none;
}
Then edit Site Texts for js.topic.reply.title to replace “Reply” with an alt-code for another symbol, like alt + 30: ▲
Then you could add custom text for each of the three button types via CSS as noted earlier.
My only concern with getting rid of “Reply” is that terms like “Last reply”, “Replies”, “Good Reply”, "Great Reply, “In Reply to”, etc. are used throughout the system, and it could be a chore to identify and change all the relevant instances appropriately.