Brings back `bitcoin_en` which was accidentally removed last time (see #17886).
Tree-SHA512: a4aaa6f22e9ad3e87952f2a87829d675158cb26ed1fe61ef8e62646c22e21ccc0dec0f890b726f8adb76d7609e0274af8574b67201d30eff941cb60b1b76ff8c
Move qt translations to a separate make include file.
This makes it easier to auto-generate this list from tooling
(see bitcoin-core/bitcoin-maintainer-tools#36).