Allow displaying videos without transcripts

cms/envs/common.py

@@ -247,6 +247,11 @@ FEATURES = {
     # Show the language selector in the header
     'SHOW_HEADER_LANGUAGE_SELECTOR': False,
 
+    # At edX it's safe to assume that English transcripts are always available
+    # This is not the case for all installations.
+    # The default value in {lms,cms}/envs/common.py and xmodule/tests/test_video.py should be consistent.
+    'FALLBACK_TO_ENGLISH_TRANSCRIPTS': True,
+
     # Set this to False to facilitate cleaning up invalid xml from your modulestore.
     'ENABLE_XBLOCK_XML_VALIDATION': True,