improved config

fixes #2370

improved fixture command

Changed csrf-var to csrf-param

gridview header/footer fix

Some missing base unit tests

Changed csrf-var to csrf-param due to meta validation error. The validation error as mentioned in the issue https://github.com/yiisoft/yii2/issues/2363. It is fixed in this pull request.

When translation is missing source language should be used for formatting

This reverts commit c94131b8.

fixed configs

check error level in error handler