html[data-use-lang=fi] [data-set-language=fi] { background-color: gray; color: white; }
html[data-use-lang=sv] [data-set-language=sv] { background-color: gray; color: white; }
html[data-use-lang=en] [data-set-language=en] { background-color: gray; color: white; }

html[data-use-lang=fi] [lang]:not([lang=fi]),
html[data-use-lang=sv] [lang]:not([lang=sv]),
html[data-use-lang=en] [lang]:not([lang=en]),
.translation-missing {
    background: yellow;
    color: red;
}