zh_CN/*.lang.php re-worked

The legacy simplified Chinese i18n files from OpenX 2.8 were very much buggy.
These files are translated based on the latest version of en/*.lang.php, and saved with utf-8 encoding.
This is still an imcomplete version. But it is sufficient for working on most daily routines as the 'Default Manager' role.
Untranslated strings in oxReportsStandard plugin
Untranslated 'Campaign delivery' in openXReports plugin
Add zh_CN translatioin for five plugins

Again, these are incomplete, but are almost enough for daily work.

The five plugins are:
* openXBannerTypes
* openXDeliveryLimitations
* openXInvocationTags
* openXMaxMindGeoIP
* openXReports
Update account-settings-banner-delivery.php

Bug in selection Delivery Options
Set default ext_bannertype value in case of not provided
Fixed incorrect email header which caused some SMTP systems to fail to send emails. #118
Fixed misspellings of the word "occurred" in code comments. #161
Fixed misspellings of the word "occurred" in error messages. #161
Fixed fullstops from upload error messages. #161
Updated release notes for changes made for #161
Merge pull request #137 from leesah/conversionTrackingReport.class.php

Untranslated strings in oxReportsStandard plugin
Updated the Reports plugin version number & re-packaged to ensure update to plugin in #137 will be included in upgrades.
Update zone-edit.php

SQLBuilder uses name 'type' for field (zone-edit.php form name delivery)
Added new contributor name to the copyright file for #118.
Added new contributor name to the copyright file for #137.
Merge pull request #162 from grupelpunt/patch-1

Update account-settings-banner-delivery.php
Updated release notes for bug fixed in PR #162.
Updated the IAB VAST Plugin to version 1.9.1 to migrate the video ad player information screen from an externally hosted location to the local Revive Adserver installation. #178
Fixed issue with bundling of the report plugin & improved the release notes for the change. #137