more expected behavior when chaining methods using
Mailser::compose()

fixes #2723

this problem occurs when joining active record but not selecting the
primary key field. records get populated but they do not have primary
key value populated which results in only one record left over in the
result.

issue #2872

Update yii.php

Update finnish translation

issue #2852

Implemented conditional validators (see #2406)

Fixed getting the count for queries with the union

typo fix in logging.md