Revert "rename Bitcoin to Bitcoin Cash for UI"
Summary: This reverts commit a8f5955c4915e04478e31d08873b7c0d94a2353b.
Test Plan: make check
Reviewers: #bitcoin_abc, O1 Bitcoin ABC, deadalnix
Reviewed By: #bitcoin_abc, O1 Bitcoin ABC, deadalnix
Subscribers: teamcity
Differential Revision: https://reviews.bitcoinabc.org/D1266