It would be nice if we could internationalize the console messages currently hard-coded into various bits of WebCore. Eric just poked me about it, and I realized that I never filed a bug for that task. I'm pretty sure that Pavel showed me one possible mechanism for localized strings at some point in the past. Any chance you remember what we talked about? :)
Unassigning myself; let's be realistic about what I'm actually working on. :/
<rdar://problem/19281566>
This is not a Web Inspector bug. You should look at LocalizedStrings.h to see how it's done for WebCore code.
Please file separate bugs per console message [source]. For example, WebSocket related messages are tracked here: https://bugs.webkit.org/show_bug.cgi?id=53224