Until Summer 2011.....

[Shai]

why did a mod specify that it was a mistake and worded improperly?

because it's vague and misleading - it could mean the first day, week, month of summer or it could mean the last.

The translation is a poor choice of words, but not inaccurate. The plan is until summer 2011 at which point it will change into a new plan and carry us into a new "time when" (autumn).

Am I talking down? Well you should see the things Peregrine said to me. ^^
That I should re-learn English, and mail my degree back. Hehe.

I know people don't like a grammar Nazi.