There is a double problem (probably linked) with the translation of the SPARQL query service ( http://query.wikidata.org/ ) :
- when « Brezhoneg » is selected (Breton in the Breton language) the interface is in fact in what seems to be Brazilian Portuguese (probably a confusion in the lang code, Breton is 'br' - in ISO 639 - and Brazilian Portuguese is 'pt-BR' - in IETF)
- the actual translation of the interface in Breton is made on Translate Wiki. 100 % of the messages is translated (see on TW) but they are not retrieved