Remove duplicated data from legacy events

When event-tracking was fully integrated into the platform, some data was replicated in the context in the middleware and then later extracted and moved the old location by event-tracking. The legacy code path was not updated to remove this transient shim data from the context resulting in duplication of the information. This patch ensures that the transient information is removed from the context before emitting the event.

Fixes: AN-2369
Add Eng (GB) and Albanian lang codes
allow rsyslog to be none
Update translations (autogenerated message)
updating handlers list to conditionally include syslogger-remote
Annotation Tool: Flagging plugin should now allow instructors to remove flags from annotations

Annotation Tools: Added lots of comments, fixed spacing, fixed slice issue

Annotation Tools: i18n fixed for this tool

 - fixed Translator to Translators

Annotation Tools: Removed unnecessary class and worked with element object
Instructors can view previously sent email content

Previously on the send email page of the instructor dashboard, instructors could only view
task information about emails they've sent for their course in the past.
In addition to this, I've now added the ability to see the content of all previously sent emails.

A "Sent Email History" button has been added to the page. When clicked, a table displaying the
subject line, number of emails sent, and date/time of submission for each previously sent email
is created. An instructor can then click on any subject line to see the content of that email,
displayed in a modal window that appears on the page.

The window is also equipped with a "copy email to editor" button, which copies the emails contents
to the tinyMCE editor, so that an instructor can easily resend an email that they've sent
in the past.
Refactor ADVANCED_COMPONENT_TYPES

    Modified to a setting in CMS common.py and aws.py
    Also factored out are: ADVANCED_PROBLEM_TYPES

    This enables third parties to add XBlocks to their system
    without having to make a code change.

    Code also added to ensure that a component should exist in both
    ADVANCED_COMPONENT_TYPES and the course advanced module list
    in order for it to be enabled in the course.
Added clarification for events that do/not include session values
Fix filter with new opaque key, allowing user to set COURSE_LISTING as old way path
Cleaned pylint quality issues in instructor email content history code.
update export_all_courses management command to count and list all failed export courses
Fix Video Player Initialisation Issue
Allow verified to be offered without audit
fixup! Allow verified to be offered without audit
Add the ability to override non-standard verified mode names
Add an optional description field to course modes.
Fix up tests and enrollment behavior.
Course Instructor as financeadmin role, will be able to download all purchase transactions in the course as a CSV file
Move a few HTML elements on the instructor dashboard page