There are many grammar errors throughout /lang/en/language.php (and probably other languages). These need to be fixed.
The one that plagued me earlier today was with a replacement of "You have" with "You have got". For instance, it replaced "You have 0 new messages" with "You have got 0 new messages" - it broke the grammar of the sentence, instead of fixing it. Not to mention, it was hard to track down in the first place; I couldn't figure out why the template wasn't taking effect!
P.S. I couldn't figure out how to use dev.tw.o so I posted this here... Make the site easier to use, or don't bother having it at all! I was almost discouraged from posting this bug but luckily SourceForge has a nice interface.