Is really internationalization that important for a development tool? I suspect that most developers need to be pretty fluent in English anyway, which means that it's energy better spent on other features.
I do share your opinion : my primary language is French and I am much more productive when I don't have to switch from one language to another in the same tasks. Some of my DB tools have French interfaces and I do switch them in English as soon I have to code some SQL requests
Is it possible to add the bold font option to the “Fonts Picker”? I have a small laptop that I used when travelling and if the font is in bold I can see it much better.