Merge pull request #15133 from edx/LEARNER-842-show-language-selector-in-lms-footer

cms/envs/bok_choy.env.json

cms/envs/common.py

cms/templates/widgets/header.html

...on/djangoapps/pipeline_mako/templates/static_content.html

lms/envs/bok_choy.env.json

lms/envs/common.py

lms/envs/devstack_docker.py

lms/templates/footer.html

lms/templates/navigation.html

lms/templates/widgets/footer-language-selector.html

openedx/core/djangoapps/lang_pref/api.py

openedx/core/djangoapps/lang_pref/tests/test_api.py

themes/edx.org/lms/templates/footer.html

themes/red-theme/lms/templates/footer.html

themes/stanford-style/lms/templates/footer.html