Unified the syntax of the XML root element (common)

Execluded all XML files in the directory doc/common/tables because
they are autogenerated.

The XML root element of Docbook XML files should match the following
format:

<ELEMENT xmlns="http://docbook.org/ns/docbook"
  xmlns:xi="http://www.w3.org/2001/XInclude"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  version="5.0"
  xml:id="THE_XML_ID_OF_THE_ELEMENT">

Change-Id: If12091be81ec8b2e6e53bfcb4c3a883a65e24736
Imported Translations from Transifex

Change-Id: I5e58a5eee0f6683f20908b14bd2a80f88ff6be7c
Merge "Unified the syntax of the XML root element (common)"
Merge "Imported Translations from Transifex"