video language setting

Hi there! My first message... When I'm searching a video about a new phone for example. I get a lot of results In Russian, Asian or in other languages. No problem of course, but I don't understand a thing of it :) Is there a way to block this in search results? So I only see results in my...

Does anyone have any experience testing whether the language specified in the advanced settings when publishing ones video has any effect on where your videos are promoted eg. in related videos and search? We've left ours unspecified on most of them but I see there is an option for English US...