System has been modified. Pls contact the manufacturer. Thank you. -- i don't know what this mean and something's wrong with my phone.
There are only two ways out of this:


restore the backup you (probably didn't) make before tampering with system files
try to backup what you still can, and flash the system (either with the stock ROM for your device, or with any matching custom ROM, whatever you prefer. If you don't know where to get that, take a look at Where can I find stock or custom ROMs for my Android device?


For the future please note that everything you delete in /system will be gone for good. Always make a backup before you play there – and make yourself familiar first with what you're up to do ;)