Fixed #16822 -- Added RawPostDataException

Thanks jaylett for the patch.
Fixed #20568 -- truncatewords_html no longer splits words containing HTML entities.

Thanks yann0 at hotmail.com for the report.
Fix grammatical errors in email documentation
Merge pull request #1719 from dlo/docs/email-typos

Fix grammatical errors in email documentation
Fixed #21243 -- Corrected exception message in multiple database tests.

Thanks to vajrasky for the report and patch.