For 1.92, you can do this:

For 2.0, I'd recommend making this field one of those that can be translated into multiple languages via the quick translation feature.

Hello,

Can use pseudo class lang too in template.css:

And in template.css
Denis

Sorry to dig up this (old) thread, but I've got a serious problem with validation of subquestions. I've attached my survey here (sorry, it's in Dutch, but easy to understand as I've stripped it down to the problematic question).
I really don't see why I can't get past the question (when testing the whole survey, that seems to be impossible, a message keeps popping up). Regular expressions have been validated, everything seems fine with "realtime validation", but impossible to get past the question.
Could you guys please take a look and tell me what I'm doing wrong?
Thanks in advance!

Okay, I already found the solution.
Apparently, regular expressions in LimeSurvey need to start & end with / character.
It was possible to notice in the example, but I found it nowhere clearly stated, only here (point 2)

If you are missing this information at our manual, please add it there. It's a wiki, everyone can edit it.

You can also post a feature request at our idea tracker to add some JavaScript validation before saving a regular expression. Such a script can check for the first characters and throw an error.

Okay, I added the note to the wiki page.

Thanks for your help.

Feeld free to improve the manua whenever something is missing or not clear.

debianese wrote: To my kniowledge Limesurvey 2 supports multilingual question attributes at the advanced question settings.

There is also an interesting blog post at www.limesurvey-consulting.com which describes different methods of validating email addresses:
"How to validate email addresses at Limesurvey"