If you use Google Chrome, you can right-click anywhere on a page and choose "Translate to English" (or whatever your primary language is) and it will do best-effort in-place translation. You don't have to click on any links.
For those complaining, it turns out to be quite hard to stop actual human spammers, without also impacting normal users. A person creates throwaway e-mail accounts, uses those to create forum accounts, logs in, and then turns on their post-bot software that starts spamming up the place. Anyone doing this for a profit has ways of getting around IP bans, and unless you block all anonymous e-mail hosting domains that provide free e-mail accounts for anyone who wants to sign up, there's no way to ban accounts from known domains.
The only real thing you can do is to quickly delete the spam before it gets indexed by Google, etc. If you stamp it out as fast as they create it, you become a lower-priority target, though any forum with a lot of traffic is going to be a target.
The exact same spam posts are scattered all over the Internet. If you do a Google search on some of the spam thread titles, you'll find plenty of other sites with the exact same message on it.
The only real way to block it would be to put the forum behind a paywall. Even a $1 a year membership would probably kill it, but then it might also reduce the number of people who participate at all, given the large number of posters who don't even pay for a Basic membership.