Don't list the language you need by name as a requirement, list knowing _multiple_ languages as the requirement.
That's a horrible idea. I don't even bother applying to job ads that don't list the language(s) needed.
That's like a "car driver" ad that doesn't say what type of car you'll be driving. Any professional driver should be able to learn to drive just about any car very quickly, but there is a HUGE difference between a limo driver and a taxi driver, even though they both drive 4-wheeled vehicles with passengers to and from reasonably close locations. Not only are there skill differences (using the taxi dispatch system versus navigating narrow spaces and bumps in a limo), but the level and type of interactions with the clients is completely different and some people simply don't WANT certain work environments and you're wasting their time and yours having them come in for an interview they will immediately walk out of after 5 minutes.
Simliarly, there is a HUGE difference between a job posting for PHP and Javascript than one for Python and CUDA or one for embedded C and assembly. A Javascript and CSS developer is going to have to be aware of XSS and SQL injection not to mention NPM and Compores. A Python/CUDA position is likely dealing with machine learning or other math-intensive work where a strong math background will play a big part and a C/Assembly position may involve microprocessors where a background in basic electronics would be beneficial.
There are also languages that I will specifically avoid. If a "Software Developer" job posting asks for NodeJS and Electron, I'll skip that ad because I personally can't stand Javascript and don't enjoy web developement. A job for Python or C on the other hand is usually a completely different type of development and is something I'm much more likely to apply for and a position that the company is much more likely to hire me for.
If you want the best employees, tell them as much as you can about the position right from the start or they'll just skip your vague uninformative ad for another one and you'll only get applications from the desperate job seekers that keep failing interviews.