The PHP session system will hold a lock on the session until it is released.
It is important to release the session before performing long-running tasks
so that further requests from the agent are not locked.

oops: Fix bad HTML entity #2

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix image CID rewrite for some pasted images

Reviewed-By: Peter Rotich <peter@osticket.com>

users: Update information on CSV import

Reviewed-By: Peter Rotich <peter@osticket.com>

i18n: Translate gb2312 to gbk charset

Reviewed-By: Peter Rotich <peter@osticket.com>

html: Ensure text internal note preserved

Reviewed-By: Peter Rotich <peter@osticket.com>

Preserve text formatting on the internal note posted to a new ticket by
staff if HTML thread is disabled.

This is necessary for some mail clients which indicate encoding in GB2312
but actually use GBK encoding.

tnef: Fix various TNEF processing issues

Reviewed-By: Peter Rotich <peter@osticket.com>

email: Properly detect bounce message with alternative content

Reviewed-By: Peter Rotich <peter@osticket.com>

fix translation for "Add new list"

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix a few translatable phrase issues

Reviewed-By: Peter Rotich <peter@osticket.com>

mailer: Embed the Message-Id token in @class

Reviewed-By: Peter Rotich <peter@osticket.com>

Ensure consistent name formatting for agents and end users

Reviewed-By: Peter Rotich <peter@osticket.com>

email: Support agents emailing as collaborators

Reviewed-By: Peter Rotich <peter@osticket.com>

This correctly handles a bounce message with the following layout:

multipart/report; report-type=delivery-status
    multipart/alternative; differences=Content-Type
        text/plain; charset="us-ascii"
        text/html; charset="us-ascii"
    message/delivery-status
    message/rfc822

Fixes #1854

Several mail clients do not return the Message-ID header in a In-Reply-To or
References header as they should. The assumption by such mail clients is
that the email be threaded based on the Subject header. However, osTicket
does not require the ticket number to be placed in the Subject header and so
has trouble threading email from such systems. osTicket embeds a copy of the
Message-ID header (or compatible version) in the body of the message in
hopes part of the message will be returned.

Many mail clients (such as osTicket) strip and clean the HTML when
processing HTML email. Previously, the message-id token was embedded in a
@data-mid attribute, which was likely stripped before the HTML email would
be returned back to osTicket.

This patch suggests that the token be placed in a @class attribute, which
has a much better chance of returning to osTicket.

Follow-up PR to the comment here:
https://github.com/osTicket/osTicket-1.8/commit/06d3a0f3e2a4557ca72faa916859b9315635dfe4

Copy+Pasting images from a ticket thread or from a FAQ article to the HTML
editor and submitting will result in the URL *not* being properly rewritten
for storage in the database. When images are uploaded, a relative URL is
returned from the server and embedded in the HTML editor. However, when
images from the system are copy and pasted into the editor, an absolute URL
with the http:// scheme is included. This URL was not properly handled by
the URL rewriter in Format::localizeInlineImages().

This patch addresses the issue by properly handling both relative URLs from
image uploads and absolute URLs from copy and pasting.

Fixes #1926

Also fix bug where bogus charset names like `iso` were confused with valid
charset names starting with that text, such as `iso-8859-2`.

add __() function for not translated words.