Backport of 1b49b792 from master.

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Support for passing bytestrings to the database API was removed in
301de774.
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This reverts commit f3f31b0f.

This reverts commit a47dd99c.

SessionBase.decode() is the inverse operation to SessionBase.encode().
As SessionBase.encode() always returns a string, SessionBase.decode()
should always be passed a string argument. Fixed the file backend, which
was the only backend still passing a bytestring.

Backport of bdae19cf from master

The mysqlclient cursor attribute `_last_executed` is always stored as
bytes. Decode it.

TextField values are already type str. No need to decode.

Backport of efd8a82e from master

Support for bytestring templates was removed in
3a148f95.
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Thanks Claude Paroz & Tim Graham for collaborating on the patch.

# Conflicts:
#	tests/auth_tests/test_views.py

Backport of a4932be4 from master

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Upcoming German translations will not differ for past and future naturaltime
translations. Using Czech language instead.
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[2.1.x] Fixed #29630 -- Fixed crash of sliced queries with multiple columns with the same name on Oracle 12.1.

Regression in 0899d583.

Thanks Tim Graham for the review and Jani Tiainen for help.
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Regression in 3b429c96.
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