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HTML code generated by Special:ExpandTemplates is not valid as it does not quote attribute values 
for "rows", does not specify required "cols" attribute, uses "POST" instead of "post" as the form 
method, and does not specify a value for "disabled" attribute.

Also, the default messages include <nowiki> tags which are not interpreted properly, but output 
verbatim, which makes for another XHTML error.

Created attachment 3048 [details]
Patch for the described problems

A fix would be simple, something like this should be enough...

Can you minimize the patch? This seems to include a lot of unrelated
localization changes.

It does not, the messages need to be also fixed because of the above mentioned
<nowiki> problem (read the linked validator output). I have only replaced all
<nowiki>{{</nowiki> with &#x7b;{.

Fixed in r19266.