Our website has many articles in English, and perhaps 20% have Spanish versions. These are very carefully translated, fixed texts (not translated on the fly). This is California so providing Spanish version where we can is important, but speakers of one language can usually understand a few key words in the other.
Is there a consensus on the best or most effective placement for these? Is there evidence whether users prefer all articles on the same topic listed together, versus all articles in the same language listed together?