Issue #1741386 by lazysoundsystem, rasmusluckow, andypost, Lars Toomre, dcam: Removing t() from asserts in simpletests in book module.
Issue #1864360 by oadaeh: Fixed Clean up some inconsistencies with @link...@endlink.
Issue #1857956 by catch, David_Rothstein: Do not re-prepare comment update timestamp if it's the same as the created timestamp (performance improvement).
Issue #1565322 by Jorrit: Fixed Notice in locale_languages_edit_form_validate().
Issue #1156576 by pixelite, Ryan Weal, jhodgdon, plach, Albert Volkman: Better documentation for language negotiation.