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 '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
Fix Wrong date format for Spanish
Bumped to 3.0.3-dev
Fix russian in language/ru/maintenance.lang.php
Merge pull request #206 from juanjosepablos/master

Fix Wrong date format for Spanish
Updated release notes post release of Revive Adserver v3.0.2
Updated the release notes for #206
Fixed some instances of the old application name in robots.txt files. #214
Fixed PHP 5.4+ compatibility
Added chainedZoneId to zone API
Updated example ZoneInfo and API endpoint
Updated release notes
Merge pull request #222 from revive-adserver/api-improvements

Fixed API compatibility with PHP 5.4+. Added zone chaining support to the API.
Fixed issue with detecting upgrades from newer Revive Adserver installations as “OpenX Source” still. #214.
Merge pull request #228 from revive-adserver/214_incorrect_name_on_upgrade

Fixed issue with detecting upgrades from newer Revive Adserver installat...
Refactored the location of the old OA_Sync class to a new location for Revive classes. #229
Fixed some comment typos noticed while performing related refactoring. #229
Branding updates noticed while updating related code. #229