xml syntax

l10n
#1

Hi all,

I've reviewed several of the xml syntax failing checks for several
languages. It appears that most of the time, there are errors in the
writing of the tag, like <ahelp>> or the missing closing tag (</ahelp>
for example). Note that if you translate on Weblate, these can be
automatically transferred to your language by clicking on the tag in the
source field or by using Ctrl+ the number in the order of apparition
(i.e Ctrl+1 for <emph> if it's the 1st tag and Ctrl+2 for </emph>)
Some other languages have translated these tags, please don't do that as
it breaks the build and the translation will be put on fuzzy state.
I'll complete the page here
https://wiki.documentfoundation.org/UI_and_Help_files_Content_Guide#XML_elements_in_Help_files
as Olivier has introduced new tags, but please in doubt, check that page
or ask here.

Cheers
Sophie