I installed Roundcube for a client with latvian language interface. Everything was fine, I tested on different browsers.
But then client sent me an email that says that interface is still in English, and a screenshot that proves it. So, on his computer ( IE8 ) all Roundcube labels has set to defaults, except for page title.
What could be wrong?
The default language is automatically detected based on the language the browser sends to the web server (List of HTTP headers - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/List_of_HTTP_headers)). So if the browser does not send a latvian language header you can not expect that the interface automatically shows latvian labels. The user has to adjust his language preference in the settings section.
You can also set thedefault language by setting the $rcmail_config['language'] in the /config/main.inc.php
Ok, thanks.