We have 100s of thousands to millions of pageviews per day in 10s of languages on the various pages of our site. The site grows from A/B testing and I have to say that many of these small things do add up over time (they add up to measurable conversion in the funnel). There is the odd one that surprisingly does nothing or does worse but generally, paying attention to language details did prove effective for us. I work on this stuff everyday in a small team where we know more than 30 languages between us and sometimes just two or three of these small changes more than pay for our annual wages in just a month.
