Merge pull request #12799 from edx/ibrahimahmed443/override-language-selector

allow SHOW_LANGUAGE_SELECTOR to be overridden by MICROSITE_CONFIGURATION

common/djangoapps/pipeline_mako/templates/static_content.html

@@ -166,7 +166,7 @@ else:
 %></%def>
 
 <%def name="show_language_selector()"><%
-    return settings.FEATURES.get('SHOW_LANGUAGE_SELECTOR', False)
+    return get_value('SHOW_LANGUAGE_SELECTOR', settings.FEATURES.get('SHOW_LANGUAGE_SELECTOR', False))
 %></%def>
 
 <%def name="get_released_languages()"><%