Revert "Open ended panel headings not internationalized."

This reverts commit eb9133aeb687c0d103feec16371ad7d2bce952a8.

ORA-352
Merge pull request #3176 from edx/hotfix/revert-openended-i18n

Revert "Open ended panel headings not internationalized."
Test that TemplateLookup dirs are not cleared during lms startup.

LMS-2498