What is the proper locales configuration?

[pricejn2]

Hello,

This is a really basic question, but I'm trying to understand why my output on a headless, non-GUI Debian box is incorrect. Works fine on another equivalent machine with Gnome desktop. What am I missing here?

# youtube-dl --get-filename -o "%(title)s.%(ext)s" BaW_jenozKc -v
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--get-filename', '-o', '%(title)s.%(ext)s', 'BaW_jenozKc', '-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.10.15
[debug] Python version 2.7.3 - Linux-3.2.0-4-amd64-x86_64-with-debian-7.6
[debug] Proxy map: {}
youtube-dl test video ''_äâ­ð.mp4

# locale
LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_CTYPE=en_US.UTF-8
LC_NUMERIC=POSIX
LC_TIME=en_US.UTF-8
LC_COLLATE=POSIX
LC_MONETARY=en_US.UTF-8
LC_MESSAGES=en_US.UTF-8
LC_PAPER=en_US.UTF-8
LC_NAME=en_US.UTF-8
LC_ADDRESS=en_US.UTF-8
LC_TELEPHONE=en_US.UTF-8
LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=en_US.UTF-8
LC_ALL=

[pricejn2]

not a youtube-dl issue