change default facility of SyslogTarget

Added unit tests for Widget\ActiveField

LOG_SYSLOG - messages generated internally by syslogd. As we know PHP is not a part of syslogd therefore we should use LOG_USER. (additionaly LOG_USER is the only valid log type under Windows operating systems)

Not sure that I follow the last two paragraphs, but I may just be tired.

Already mentioned earlier in the text

Edited through “attaching”; added “event handler order” subsection

I think it should be: event handlers, attaching, triggering

fixed inflector camel2id and id2camel

Update Thai Translation

 in migration controller to be compatible to more backends

fixes #3947

fixes #4123

Switched to Codeception 2.0.* for application template tests

Missing semicolon

New Chinese translations are ready to serve

Schema name was not used in ’SHOW CREATE TABLE’  query

Fixed bug where schema name was not used in ’SHOW CREATE TABLE’ query in `yii\db\mysql\Schema`

close #4162

Concept-service-locator - Russian translate

Guide-zh-cn/start-installation.md proofread.