Question

I have a Grails web application running on a german localized machine.

How does Grails determine the language to use? From the webbrowser? From the systems setting? Is this changeable with altering the language used for the ui (eg with this one: http://grails.org/plugin/lang-selector)? If not, how is it changeable?

Reason is that (seldom) i have users that access the webapp via (english) terminalserver. And there is some strange behaviour with number input (comma, dot, …)

Answer 1

From http://grails.org/doc/latest/guide/i18n.html

By default the user locale is detected from the incoming
Accept-Language header. However, you can provide users the capability
to switch locales by simply passing a parameter called lang to Grails
as a request parameter:

/book/list?lang=es

Grails will automatically switch the user’s locale and store it in a
cookie so subsequent requests will have the new header.