I am developing a website that support both English and Arabic. The problem is that when I use a specific font size, English looks bigger that Arabic. I know how I can work this out using CSS but if there are fonts that overcome this by default that would save time and make future updates easy.
Make sure you're using multi-lingual fonts such as "Arial".
For your question I looked at Google Translate since they have same font size for all languages. They are using there the following line as "font-family"
Take notice that letters' width and height may vary between languages and may cause the feeling of "smaller letters".
hope that helps :) glhf