{
    "authentication not found": "Authentication token not found!",
    "authentication invalid": "Authentication token is invalid",
    "user duplicate": "Such user already exists!",
    "user invalid syntax": "Invalid syntax in one of user's parameters!",
    "user already in group": "User is already in group!",
    "user not found": "User does not exists!",
    "admin leave": "You are an admin of that group. You must transfer ownership of that group first!",
    "username taken": "Username is taken!",
    "username not found": "Such username not found!",
    "username required": "Username is required!",
    "password required": "Password is required!",
    "password invalid": "Wrong password!",
    "group name taken": "Group name is taken!",
    "group name not found": "Group with such name not found!",
    "group id not found": "Group with such ID not found!",
    "group not an owner": "You are not an owner of this group!",
    "group not a member": "You are not a member of this group!",
    "name not specified": "New name of a group is not specified!",
    "new owner not specified": "ID of a new group owner is not specified!",
    "abstract product not found": "Such abstract product is not found!",
    "abstract product invalid syntax": "Invalid syntax in one of user's parameters!",
    "barcode not found": "Such barcode not found!",
    "barcode duplicate": "Such barcode already exists!",
    "barcode too long": "This barcode is too long!",
    "barcode invalid syntax": "Invalid syntax in barcode!",
    "abstract product name not found": "Abstract product with such name not found!",
    "abstract product name duplicate": "Abstract product with such name already exists!",
    "abstract product name too long": "Abstract product name is too long!",
    "abstract product name invalid syntax": "Invalid syntax in abstract product name!",
    "net weight too long": "Specified net weight is too long!",
    "net weight invalid syntax": "Invalid syntax in specified net weight!",
    "image hash too long": "Specified image hash is too long!",
    "image hash invalid syntax": "Invalid syntax in specified image hash!",
    "category too long": "Specified category is too long!",
    "category invalid syntax": "Invalid syntax in specified category!",
    "category not found": "Such category not found!",
    "unit too long": "Specified unit is too long!",
    "unit invalid syntax": "Invalid syntax in specified unit!",
    "product not found": "Such product not found!",
    "product invalid syntax": "Invalid syntax in one of product's parameters!",
    "abstract product id not found": "Specified abstract product id not found!",
    "abstract product id invalid syntax": "Invalid syntax in abstract product id!",
    "expiry date too long": "Specified expiry date is too long!",
    "expiry date invalid syntax": "Invalid syntax in specified expiry date!",
    "categories not found": "Such category not found!",
    "categories duplicate": "Such category already exists!",
    "categories invalid syntax": "Invalid syntax in one of category parameters!",
    "ok": "Successfull.",
    "invalid syntax": "Invalid syntax!",
    "png only": "Only .png files are allowed!",
    "too long": "Specified value is too long!",
    "unknown": "Unknown server error. Please, contact the develoeper!"
}