L10N: Updated Czech translation from Transifex
L10N: Updated Danish translation from Transifex
L10N: Updated German translation from Transifex
L10N: Updated Spanish translation from Transifex
L10N: Updated Swedish translation from Transifex
L10N: Updated French translation from Transifex
L10N: Updated Chinese Simp translation from Transifex
L10N: Updated Turkish translation from Transifex
L10N: Updated Finnish translation from Transifex
L10N: Updated Portuguese (Brazil) translation from Transifex
L10N: Initial partial Persian translation from Transifex
L10N: Initial partial Telugu translation from Transifex
[Engine-VBulletinChatbox] Initial vBulletin Chatbox support.

Initial protocol module for the vBulletin Chatbox plugin.
[Engine-VBulletinChatbox] Fix skipping old messages.
[Engine-VBulletinChatbox] Leave message parsing to MessageBuilder.
[Engine] Use HtmlAgilityPack to parse HTML and improve image parsing.
[Engine-VBulletinChatbox] Implement /me support.
[Engine-VBulletinChatbox] Trace calls.
[Engine-VBulletinChatbox] Update token if sending fails; Unicode

Update the security token and, failing that, try to log in anew if
sending a message fails the first time. Include commands to do this
manually.

Also, add Unicode support (decimal XML character escapes).
[Engine-VBulletinChatbox] Fix /relogin and /retoken.

* /retoken shouldn't request the security token twice.
* /relogin should request a new security token after login.