On my dev instance, when I preview a survey using a different language, all the localizations work fine.

On my prod instance, it doesnt matter what language I select, English is always being shown. I have confirmed that the locale templates exist.

Are there some db or locale .mo or .po paths that I should check that would cause this? If the localization templates were compiled on one environment and copied over to another, do the paths make any difference as long as the directory structure is the same?

forgot to include that I'm running Version 1.85+ (7337).

I added the following to my config.php and it appears to have resolved the problem:

$translationmode = 1;

This works for older version < 1.90. Since 1.90 this problem should not show up anymore.