Bug: Lilypond Compiler ignores MacOS Language Preference

[cckborg1]

Lilypond Version 2.18.2-1
Mac OS 10.12.5.

Lilypond Compiler messages ignore designated Primary Preferred Language.

My settings: 
Preferred Languages: English -U.S. (Primary), Greek
Region: United States

Compiler messages are a mix of English and Greek.





If I add Spanish-U.S. but keep English as primary and Greek, then messages are 
a mix of Spanish and Greek.





If I remove all additional languages and keep only English, then messages are 
fully in English.





I quit and restarted Lilypond after each System Preference change.

Carol Kankelborg