It's safe to drink. It's going to be sour (thin white film is pretty characteristic of a lacto infection), but that doesn't mean it won't be good. It should bottle condition, but it's a bad idea to bottle before it reaches a stable gravity.
To prevent future mishaps, give your carboy a good soak in PBW or Oxyclean, and replace your plastic parts.
As far as airlock activity, see my signature line.
"I can't believe how many people think Air Lock is pronounced Hydrometer." -BigKahuna
"If you gave me a beer with placenta in it without telling me I would kick you in the nuts." -ODaniel
"We be in a big hurry for dope beer with much alcamahol and flavor, quality, balance, and aroma don't matter. We just wantz to be druck, u know?" -Yooper