I created a survey and added to languages to it, Portuguese (Brasilian) and Spanish (Mexico), both enabled in the general preferences too. I can see the switcher in my survey but when I choose a different language nothing happens. I tried different templates, different languages, but nothing... Any clue?
Did you translate into the second language? Otherwise the second language will use the text from the first language. However, the standard texts of Limesurvey should be changing though, even if you did not translate the survey texts.
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Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.