Merge pull request #3882 from edx/LEARNER-842-add-language-selector-settings

Add feature flag for footer language selector

CHANGELOG.md

 - Role: edxapp
+  - Added the EDXAPP_SHOW_HEADER_LANGUAGE_SELECTOR feature flag with default value [false]
+  - Added the EDXAPP_SHOW_FOOTER_LANGUAGE_SELECTOR feature flag with default value [false]
+
+- Role: edxapp
   - Added the EDXAPP_ENTERPRISE_COURSE_ENROLLMENT_AUDIT_MODES setting with default value ["audit"]
 
 - Role: edxapp

playbooks/roles/edxapp/defaults/main.yml

-# variables common to the lms role, automatically loaded
+# variables common to the edxapp role, automatically loaded
 # when the role is included
 ---
 
@@ -229,6 +229,12 @@ EDXAPP_PDF_RECEIPT_LOGO_PATH: ""
 
 EDXAPP_SOCIAL_AUTH_OAUTH_SECRETS: ""
 
+# Display a language selector in the LMS/CMS header.
+EDXAPP_SHOW_HEADER_LANGUAGE_SELECTOR: false
+
+# Display a language selector in the LMS footer.
+EDXAPP_SHOW_FOOTER_LANGUAGE_SELECTOR: false
+
 EDXAPP_FEATURES:
   AUTH_USE_OPENID_PROVIDER: true
   ENABLE_DISCUSSION_SERVICE: true
@@ -257,6 +263,8 @@ EDXAPP_FEATURES:
   CUSTOM_COURSES_EDX: "{{ EDXAPP_CUSTOM_COURSES_EDX }}"
   ENABLE_CSMH_EXTENDED: "{{ EDXAPP_ENABLE_CSMH_EXTENDED }}"
   ENABLE_READING_FROM_MULTIPLE_HISTORY_TABLES: "{{ EDXAPP_ENABLE_READING_FROM_MULTIPLE_HISTORY_TABLES }}"
+  SHOW_HEADER_LANGUAGE_SELECTOR: "{{ EDXAPP_SHOW_HEADER_LANGUAGE_SELECTOR }}"
+  SHOW_FOOTER_LANGUAGE_SELECTOR: "{{ EDXAPP_SHOW_FOOTER_LANGUAGE_SELECTOR }}"
 
 EDXAPP_BOOK_URL: ""
 # This needs to be set to localhost