yes, only the text can be changed on a per language base.
however, for the next update, there will be a body class that indicates which language is currently active.
this way you can use css based on the current language.
for example, german is active here, indicated by "language-de":
0_1575289858480_Screenshot 2019-12-02 at 13.30.41.png
then you could use css like:
body.language-de{
background-color: green;
}
