Yes, it would be nice to have more multilingual staffers, especially those fluent in Spanish. We are primarily an English server, however. English is our official language and it's generally expected that when you go somewhere that speaks English, you would also speak English.
When I travel to a foreign country that doesn't speak English as their primary language, I either brush up on common phrases or carry a translation book with me. It's silly to assume everyone in the world speaks your language, and this goes both ways. Obviously if you were to travel to the UK or the USA and you only spoke Spanish, you'd likely have some trouble communicating with the locals. It's no different here.
We speak English. Most of us don't speak Spanish or Dutch or German. If you wish to communicate with us, we'll try our best to speak your language, but you need to realize that even if we went ahead and added 10 new mods that spoke Spanish and English fluently, there would still be people complaining that they're not on or active enough. People don't consider timezones. People don't consider that staff have duties other than the server, such as school, work, or family. Sometimes the best we can do is Google Translate, and even that's not accurate all the time.
I've personally taught the whole staff key words to look for in reports for inappropriate language, taught them how to warn people not to swear, etc. It took me over 5 years to learn what I know, and I had to study it for over an hour each day in school plus some independent research to better understand things they don't teach in school, like internet and street slang. Neither I or the other staff have the time, skill or capability to teach/learn an entire language over the internet. Even if we started today, you wouldn't get any real significant change for at least months, at most years.
In short, we're doing the best we can with what we've got. You're asking for a lot more than what you realize when you say we need more multilingual staff. Some servers ban entire languages; we're not that close-minded. What I would ask instead is that players take into consideration that, despite our vast multinational playerbase, we are still an English server and that speaking English would benefit both ourselves and the server's community.