Pfthb

class First_Frame(Frame):
 def __init__(self,master):
 super().__init__(master)
 self.grid()
 self.widgets()

 def widgets(self):
 self.commandent1=StringVar()
 self.commandent1.set("tutaj bedzie sie pokazywal aktualny status")
 self.img=Image.open("database.XPM","r")
 self.image_true=ImageTk.PhotoImage(self.img)
 self.label=Label(self,image=self.image_true).grid()
 self.label2=Label(self,text="twoje gui uzytkownika").grid()
 self.widgets_2()

 def widgets_2(self):
 self.status_text=Label(self,text=self.commandent1.get())
 self.entry1=Entry(self)
 self.entry1.bind("<Return>",self.update_status)
 self.entry1.grid()
 self.status_text.grid()
 def update_status(self):
 self.x=self.entry1.get()
 self.commandent1.set(self.x)

You have 2 main reasons your Label (not text) widget is not updating.

Reason 1. You need to handle the event that is being passed to update_status from the binding. To do this just add event or any argument name really you want. I just use event for readability.

def update_status(self, event):

Reason 2. You need to and the less obvious reason here for some is the way you are using your StringVar() on the label widget. Here you are assigning the current text value of the StringVar() only once and never again. To properly use the StringVar() with a label widget you will need to assign the StringVar() to a textvariable argument and not a text argument.

Like this:

Label(self,textvariable=self.commandent1).grid()

Note I took out the image portion of your code as it was irrelevant to the question. Your final code should look something like this:

from tkinter import *

class First_Frame(Frame):
 def __init__(self, master):
 super().__init__()
 self.grid()
 self.widgets()

 def widgets(self):
 self.commandent1 = StringVar()
 self.commandent1.set("tutaj bedzie sie pokazywal aktualny status")
 Label(self,text="twoje gui uzytkownika").grid()
 self.widgets_2()

 def widgets_2(self):
 self.entry1 = Entry(self)
 self.entry1.bind("<Return>", self.update_status)
 self.entry1.grid()
 Label(self,textvariable=self.commandent1).grid()

 def update_status(self, event):
 self.commandent1.set(self.entry1.get())


root = Tk()
First_Frame(root)
root.mainloop()