The content library tests were failing to locate templates when rendering XBlocks, but since these tests are skipped in CI, the issue went undetected. This fix is marked temporary because a proper fix involves adding lms/templates to the cms.envs.test MAKO_TEMPLATE_DIRS_BASE list. This was tried, and caused unrelated tests to fail, and so we took this approach instead. See PR for full details.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.