Added translations for new send coins dialog box

Summary:
Adds translations for previous change made to the gui.

Partial backport of Core PR15339
https://github.com/bitcoin/bitcoin/pull/15339/files

Depends on D4154

Test Plan:

make check
cd src
make translate
bitcoin-qt -> Send -> view confirmation dialog box

Repeat last step for other languages

Reviewers: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D4208