Update main.yml

define a new var called "EDXAPP_LANGUAGE_CODE " and default to "en"
add "LANGUAGE_CODE: $EDXAPP_LANGUAGE_CODE "

playbooks/roles/edxapp/defaults/main.yml

@@ -97,6 +97,7 @@ EDXAPP_CMS_NGINX_PORT: 18010
 EDXAPP_CMS_SSL_NGINX_PORT: 48010
 
 EDXAPP_LANG: 'en_US.UTF-8'
+EDXAPP_LANGUAGE_CODE : 'en'
 EDXAPP_TIME_ZONE: 'America/New_York'
 
 EDXAPP_TECH_SUPPORT_EMAIL: 'technical@example.com'
@@ -339,8 +340,7 @@ generic_env_config:  &edxapp_generic_env
   ANALYTICS_SERVER_URL:  $EDXAPP_ANALYTICS_SERVER_URL
   FEEDBACK_SUBMISSION_EMAIL: $EDXAPP_FEEDBACK_SUBMISSION_EMAIL
   TIME_ZONE: $EDXAPP_TIME_ZONE
-  LANGUAGE_CODE : $EDXAPP_LANG
-  EDXAPP_LANGUAGE_CODE : "en"
+  LANGUAGE_CODE : $EDXAPP_LANGUAGE_CODE
   MKTG_URL_LINK_MAP: $EDXAPP_MKTG_URL_LINK_MAP
   # repo root for courses
   GITHUB_REPO_ROOT: $edxapp_course_data_dir