en: replace master and slave with leader and follower

[saghevli]

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[Lily418]

Just wanted to share some related PR #217 where some resourses and discussion was collected.

#397 issue was closed before #217 was merged and perhaps could be reopened.

[doreensacker]

Hi there! I was just wondering if this can be merged? It was kind of bothering me and I was happy to see that there is already an open PR about it :)