> Is an effort to get the language right in a marketing document too much to ask?

Yes, expecting some one who doesn't speak your language to speak your language as fluently as a native speaker is too much to ask.

English is the most widely-spoken language in the world (although not the most common first language) and is the lingua franca of the Internet. While language mistakes shouldn't be seen as evidence of technical issues, it should be common practice to ask a skilled native English speaker to review a group's public statements and marketing materials.

There are services and people even in their own company that can do better. There really isn't an excuse here.