Set position for collapsible.js full-bottom link.

Currently it is covering the whole parent div.

LMS-2852
deprecating i18n tasks from rake to paver
Update i18n.rst for rake to paver transition
Merge pull request #4148 from edx/usman/lms2852-code-problems-output

Set position for collapsible.js full-bottom link.
Merge pull request #4157 from edx/release

Release
Fix variable names to give context for translators

fix other various i18n issues
Merge pull request #4156 from edx/sarina/fix-i18n-bugs

Fix variable names to give context for translators
Do not print exception message below stacktrace
adding Tim Babych to AUTHORS
Merge pull request #4151 from edx/i18n-dont-print-exception-msg-twice

Do not print exception message below stacktrace
Merge pull request #4020 from edx/clytwynec/rake2paver-i18n

Clytwynec/rake2paver i18n
Deprecating acceptance_tests from rake to paver
update jenkins script and task args