wallet: Remove trailing whitespace from potential translation strings
Summary:
If the potential translation strings are translated in the future,
trailing whitespace is going to make translation effort harder.
This is the final part of Core PR18699 : https://github.com/bitcoin/bitcoin/pull/18699/commits/fa2cce4391b0b1bda325f695bb45f7b565c8e8ea
Depends on D7707
Test Plan:
ninja all check-all
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D7708