When it comes to custom themes, such as the NuTheme, it's best to consult with your branch's staff about it. Some branches choose to carry over the custom theme with the translation, other branches categorically refuse custom themes. So I think it varies from branch to branch. (On INT, we always carry over the theme.)
However, if it's a GoI theme or Canon theme or somesuch, those should usually also appear in the translation (unless your country bans any symbols in it (eg. swastika, hammer and sickle, Japanese sun with rays).
With regards to other coding specific to the article: Those are usually an integral part of the article itself, and should therefore also appear in the translation. If you have trouble with the technical stuff, you're welcome to ask for help in our Discord channel. We have a dedicated Tech Team to help users with such issues. ^^