The inner import was dropped during the reorganizing of the database
backends in commit 28308078.

Backport of 95058606 from master

Backport of 17b1f788 from master

Backport of 81f76517 from master

Thanks Preston Timmons for the report.

Backport of 1563b897 from master

Backport of b0bd1f0e from master

Backport of 3cb386b8 from master

Backport of 06aaed41 from master

Backport of 3c4fca27 from master

Backport of 2c3ce26b from master

Backport of 08c980d7 from master

Backport of 57202a11 from master

Updates for languages: Indonesian, Belarusian, Persian, and Dutch.

Backport of 29e90f3a from master

This is a regression caused by introducing rendered migration states in
1aa3e09c and the _meta refactoring in fb48eb05.

Thanks to Danilo Bargen for reporting the issue and Marten Kenbeek and
Tim Graham for triaging the bug and providing the initial test case.

Backport of 63f9b633 from master

Backport of cf34ee68 from master

Backport of 2b086229 from master

The test failed on RHEL6 systems running python 2.7 from a RedHat
Software Collection (SCL) because this test runs an external python
script with a stripped system environment. RedHat SCLs work by setting
a number of system environment variables when these are stripped out by
this test the python 2.7 interpreter is no longer able to function
properly because it can not find the system libraries needed.

Now we use use mock to modify the system environment directly.

Backport of 31e6c9c8 from master

Thanks to Andrew Ingram for the report.
Backport of 683ece0e from master.

Backport of 25b52d04 from master

Backport of 9c2d8cde from master

Backport of eaeea6f9 from master

Backport of d91321e8 from master

Backport of 0f2e82b9 from master

Thanks to Reto Aebersold for reporting the issue and Tim Graham and
Claude Paroz for the review.

Backport of faad6070 from master

I changed "appears" to "appear" and emphasized the word "not" to match
the rest of the document.

Backport of 0cf7477e from master

Backport of 9d6914da from master

Backport of 269a5dbd from master

Backport of 37682368 from master

Backport of ad31bc05 from master

Thanks datakid for the report

Backport of b9e972b9 from master

Backport of 618bc4e6 from master

Backport of dd99f577 from master

Backport of 1418f753 from master

Backport of 27b92228a969941d8fc0d04a894f436c0e9120c7 from master

Thanks Serhiy Zahoriya for the suggestion and Tim Graham for the
review.
Backport of 6e8cb75e from master.

Backport of 258d81ac from master

Thanks tttomekkk for the report.

Backport of b93690c4 from master