feat: Update node status text

[PHChenGit]

Issue: #1011

[yvanoers]

@PHChenGit
Thanks for your efforts!
The change looks sound by itself, but I'd prefer it if the frond end would be fed the names of the statuses by the backend. Reason for this is that the names of the statuses originate from the external Serf library and this way there's no duplication of externally defined names.
Should be doable in 3 or 4 lines of code in api.go and Dashboard.tsx.

Would you be willing to rework it like this?

[PHChenGit]

Hi @yvanoers

Yes, I can do it.
I pushed some new code to this PR and I found the Serf library has status to string method.
I also hope to avoid to change the serf.member struct, so I add statusText to struct MId

After changed the code, the ui is looked like below. You can focus on the Status column
First, It's a screenshot before changed.

And, It's a screenshot after changed.

[yvanoers]

LGTM!

[vcastellm]

Really neat, thanks!