combobox selectedindex change change language

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C#

C#4.0

Hello
I have combobox on main form with two items in it, ENGLISH and SERBIAN, basically if I choose SERBIAN my labels on main form change some english words to serbian words

this is the code

private void cmbLanguage_SelectedIndexChanged(object sender, EventArgs e)
        {            
            if (cmbLanguage.SelectedIndex.Equals(1))
            {
                label1.Text = "INFO ALARM";
                label2.Text = "INFO ALARM";
                label3.Text = txtdatahistory.Text + "\n" + "OTVORENO\n" + Activity2BS.Count;
                label4.Text = txtstoragehistory.Text + "\n" + "OTVORENO\n" + Activity3BS.Count;
            }
            else
            {
                
            }
                
        }

now as you can see when I get back to english I want to return to english words

like this

label1.Text = "INFO WARNING";
                label2.Text = "INFO WARNING";
                label3.Text = txtdatahistory.Text + "\n" + "OPEN\n" + Activity2BS.Count;
                label4.Text = txtstoragehistory.Text + "\n" + "OPEN\n" + Activity3BS.Count;

but it doesnt, point is this is small part of the code and I really dont want to type aaaallll of that code to return ti english, how to make it on else statement to return back to previous state of language because on form load is english by default