Translations:UserProfile/15/en
macOS
~/Library/Application Support/LibreOffice/4/user
(LibreOffice 4, 5 & 6)~/Library/Application Support/libreoffice/3/user
(LibreOffice 3)
For LibreOffice Vanilla provided by Collabora at the App Store check
~/Library/Containers/com.collabora.libreoffice-free
(LibreOffice 5.4)