All the answers of your questions are given below, clear your confusions about Creators Update.
Processor: 1 gigahertz (GHz) or faster
RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit)
Free hard disk space: 16 GB (32-bit) or 20GB (64-bit)
Graphics card: Microsoft DirectX 9 graphics device with WDDM driver A Microsoft account and Internet access
No you can’t change the language during the upgrade process.
Yes all of your apps will present after installing this latest update.