/usr/share/rawtherapee/languages/ is in rawtherapee-data 4.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/rawtherapee/languages/Catala
/usr/share/rawtherapee/languages/Chinese (Simplified)
/usr/share/rawtherapee/languages/Chinese (Traditional)
/usr/share/rawtherapee/languages/Czech
/usr/share/rawtherapee/languages/Dansk
/usr/share/rawtherapee/languages/Deutsch
/usr/share/rawtherapee/languages/English (UK)
/usr/share/rawtherapee/languages/English (US)
/usr/share/rawtherapee/languages/Espanol
/usr/share/rawtherapee/languages/Euskara
/usr/share/rawtherapee/languages/Francais
/usr/share/rawtherapee/languages/Greek
/usr/share/rawtherapee/languages/Hebrew
/usr/share/rawtherapee/languages/Italiano
/usr/share/rawtherapee/languages/Japanese
/usr/share/rawtherapee/languages/Latvian
/usr/share/rawtherapee/languages/Magyar
/usr/share/rawtherapee/languages/Nederlands
/usr/share/rawtherapee/languages/Norsk BM
/usr/share/rawtherapee/languages/Polish
/usr/share/rawtherapee/languages/Polish (Latin Characters)
/usr/share/rawtherapee/languages/Portugues (Brasil)
/usr/share/rawtherapee/languages/README
/usr/share/rawtherapee/languages/Russian
/usr/share/rawtherapee/languages/Serbian (Cyrilic Characters)
/usr/share/rawtherapee/languages/Serbian (Latin Characters)
/usr/share/rawtherapee/languages/Slovak
/usr/share/rawtherapee/languages/Suomi
/usr/share/rawtherapee/languages/Swedish
/usr/share/rawtherapee/languages/Turkish
/usr/share/rawtherapee/languages/default