Fix flaky acceptance test.
Fixed studio can't handle more than 9 lines in advanced settings.
STUD-1483
Display transcript translations for student in their source language.
Fix acceptance tests.
Wait for big subtitles to render.
Set big timeout for big subtitles.
Fixes potential 'too many open files error' when running all servers.
Check iframe src for the specific value TinyMCE uses.

STUD-1470
Add synchronization for rendering to studio xblock tests
Fix hash_resource to avoid encode errors.
Merge pull request #3192 from edx/ned/fix-encode-error-when-hashing-resources

Fix hash_resource to avoid encode errors.
Merge pull request #3149 from edx/alex/fix_flaky_test

Fix flaky acceptance test.
Fix flaky test #12

"CC button works correctly w/o english transcript in HTML5 mode of Video component"
Fix lms video #20: scroll view to be clickable.
Merge pull request #3198 from edx/alex/fix_flaky_video_test_12

Fix flaky test #12
Merge pull request #3199 from edx/alex/fix_flaky_video_test_20

Alex/fix flaky video test 20
Fix flaky video test #21: increase timeout.
Fix flaky video tests: speed up youtube api loading and wait for controls.
Merge pull request #3136 from edx/alex/display_native_language_2

Alex/display native language 2
Merge pull request #3169 from edx/alex/fix_more_flaky_tests

Alex/fix more flaky tests