If my broswer (Chrome, Firefox, etc.) are in English the language of the OPAC load in English. I installed Spanish version of crhome and the degault language is set to spanish. Hi, Adalid! Did this work? Do you know since which version? I just read from 3.10. release newfeatures that: /// 'I18N/L10N • Preserve language choice between Browser sessions (bug #8019) If I select a language in Staff client or Opac, I expect it to be persistent between browser sessions. This is not the case. Koha forgets the selection as soon as all Broser instances are closed, and starts up the next session with the Browser's preferred language. With this patch, the language choice is stored for up to 3 years from the last login. /// So was this browserdetection workin already 2 years behind? cheers, Gary ----- (Mr.) Kari Blomster, librarian Hailuoto Public Library, Finland | http://www.hailuoto.fi/sivu/fi/kuntapalvelut/perus/Sivistyspalvelut/kirjasto... Profiles | http://www.hailuoto.fi/sivu/fi/kuntapalvelut/perus/Sivistyspalvelut/kirjasto... -- View this message in context: http://koha.1045719.n5.nabble.com/Set-principal-language-tp4263943p5733808.h... Sent from the Koha-general mailing list archive at Nabble.com.