I've run into that resizing problem before (if it's what I think it is), just have to try to remember the fix. It works correctly for me but there's a rather obscure setting that's probably different between our computers. I'm also on Win10.
As for editing the strings in the Language list, that's based on your primary language - by default English but you can change it in Settings - the list consists of the strings in the primary language with the corresponding strings in the translated language. Any translated language strings that are missing show as blank, and any that are not in the primary language won't show. The program really isn't intended to work with inconsistent sets of strings.
