As Twitter and text messaging push vowels out of English to economize on space, could the language end up looking more Semitic than Germanic? I’m used to seeing abbreviations on Twitter, Gchat, and SMS. But I was surprised recently when an editor closed an email with “Rgds.” The “s” on the end helped me guess that it wasn’t short for “Rigid” or “Raged,” or so I hoped. Given the context, I assumed he meant “Regards.” But I wondered how such a word ended up in a business letter? Did it mean that Twitter-ese is making its way into formal, written correspondence?…