Hi Ricardo,
 after some testing I have been able to reproduce the issue from a "clean"
installation, so I created a bug report for it:
I have to admit that I have no idea (yet) what causes the issue.
Thank you very much for reporting the issue - knowing that something is not right is the
first step in fixing it :)
Clemens
  Hi! Please, allow me to top post: it will be easier to
summarise.
 Clemens's answer did the trick. Here you'll see how my Blog.BlogSheet looked
before editing its title as Clemens suggested...
 
http://goo.gl/k4T6ub
 Now, after an upgrade to 6.4 and after editing the title it looks good...
 
http://idis1.idisantiago.es:8080/xwiki/bin/view/Blog/
 I also come from a 5.x release. And I also remain clueless about the origin of the issue:
all upgrades have been done by overwriting all pages with the new staff.
 Hope this helps to learn what could had been wrong!
 Thanks and cheers!
 Ricardo
 --
 Ricardo Rodríguez
 Research Management and Promotion Technician
 Technical Secretariat
 Health Research Institute of Santiago de Compostela (IDIS)
 
http://www.idisantiago.es
 ________________________________________
 De: users [users-bounces(a)xwiki.org] en nombre de Clemens Klein-Robbenhaar
[c.robbenhaar(a)espresto.com]
 Enviado: martes, 11 de noviembre de 2014 15:39
 Para: users(a)xwiki.org
 Asunto: Re: [xwiki-users] localization string missing - xe.blog.code.title
 On 11/11/2014 02:54 PM, Marius Dumitru Florea wrote:
  I don't have this problem. FYI, the Blog
title comes from
 Blog.BlogSheet which uses this code
 #evaluate($!doc.getValue('title'))
 and the value of the title property (Blog.BlogClass) from Blog.WebHome is
 $services.localization.render('xe.blog.code.title')
 I guess #evaluate() fails in your case. But it's not related to
 missing translation. You would get 'xe.blog.code.title' displayed if
 the translation was really missing.
 
 I can reproduce it with a wiki upgraded from 5.4.x (forgot which x) to 6.2
 The problem is that the "#evaluate(...)" is missing in the title
 To fix this manually, edit this page:
   
http://idis1.idisantiago.es:8080/xwiki/bin/view/Blog/BlogSheet
 In the "title" input field it might just read:
   $doc.getValue("title")
 replace this with:
   #evaluate($doc.getValue("title"))
 and the issue should go away.
 I have to admit that I am a bit clueless why this might happen;
 but in my case I suspect I messed around with import/export too much
 and overwrote the BlogSheet with the wrong version ...
 Hope this helps, too ;)
 Clemens
  Hope this helps,
 Marius
 On Tue, Nov 11, 2014 at 3:32 PM,
 <Ricardo.Julio.Rodriguez.Fernandez(a)sergas.es> wrote:
  Hi everybody!!!
 Please, allow me some small talk... I'm really happy to be here again once I've
managed to get and start enjoying a brand new 6.2.4. XWiki installation!
 Only a detail: after following the evolution of the 6.x branch and having installed the
new 6.2.4 release, a string seems to keep lacking affecting the renderization of
Blog.WebHome.
 Here it is what I see not only here, but in a number of installations around the net...
http://atriumkm.idisantiago.es/bin/download/ICT/Images/blogLocalizationMiss…
 I guess you get the same result by accessing directly this site...
 
http://idis1.idisantiago.es:8080/xwiki/bin/view/Blog/
 Please, even though it is kind of a trivial problem not affecting, shouldn't it be
fixed?
 Thanks!
 Ricardo
 --
 Ricardo Rodríguez
 Research Management and Promotion Technician
 Technical Secretariat
 Health Research Institute of Santiago de Compostela (IDIS)
 
http://www.idisantiago.es
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 --
 Clemens Klein-Robbenhaar
 Software Development
 EsPresto AG
 Breite Str. 30-31
 10178 Berlin/Germany
 Tel: +49.(0)30.90 226.763
 Fax: +49.(0)30.90 226.760
 robbenhaar(a)espresto.com
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 Zertifiziert nach ISO 9001:2008
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mit freundlichen Grüßen
Clemens Klein-Robbenhaar
--
Clemens Klein-Robbenhaar
Software Development
EsPresto AG
Breite Str. 30-31
10178 Berlin/Germany
Tel: +49.(0)30.90 226.763
Fax: +49.(0)30.90 226.760
robbenhaar(a)espresto.com
HRB 77554 B - Berlin-Charlottenburg
Vorstand: Maya Biersack, Peter Biersack
Vorsitzender des Aufsichtsrats: Dipl.-Wirtsch.-Ing. Winfried Weber
Zertifiziert nach ISO 9001:2008