Error during build:
/usr/bin/lrelease -compress -nounfinished -removeidentical ../translations/monero-core_de.ts -qm /x/monero-core/build/release/bin/translations/monero-core_de.qm
lrelease error: Parse error at ../translations/monero-core_de.ts:500:59: Expected '#' or '[a-zA-Z]', but got '%'.
Appears to be a typo in german translation file. Removing character builds this stage OK