Set LANGUAGE to en_US:en for apt-cache policy

acloud will parse apt-cache policy result to check required package.
This is in case user's using different language for apt.

Bug: 244257191
Test: atest acloud_test &
sudo apt-get remove ssvnc &
acloud-dev create &
Check ssvnc will be installed during create process

Signed-off-by: prosixe <prosixe@gmail.com>
Change-Id: I3b1e6d01427511c60bb73eeace3a39fb8ca2ab0c
diff --git a/setup/setup_common.py b/setup/setup_common.py
index 97ea141..dababd4 100644
--- a/setup/setup_common.py
+++ b/setup/setup_common.py
@@ -27,7 +27,7 @@
 logger = logging.getLogger(__name__)
 
 PKG_INSTALL_CMD = "sudo apt-get --assume-yes install %s"
-APT_CHECK_CMD = "LANG=en_US.UTF-8 apt-cache policy %s"
+APT_CHECK_CMD = "LANG=en_US.UTF-8 LANGUAGE=en_US:en apt-cache policy %s"
 _INSTALLED_RE = re.compile(r"(.*\s*Installed:)(?P<installed_ver>.*\s?)")
 _CANDIDATE_RE = re.compile(r"(.*\s*Candidate:)(?P<candidate_ver>.*\s?)")