remove use of ngettext in discussion jasmine test
Merge pull request #5051 from edx/jsa/fix-thing

remove use of ngettext in discussion jasmine test
Minor styling tweaks.
LMS-11302
Merge pull request #5005 from edx/waheed/lms11302-fix-external-link-alignment

Minor styling tweaks for external resource button in LTI component.
Add video link transience for S3 hosted videos.
Add test.