Sort by letter bug

[ugury3806]

There's a bug when sorting by letter in Turkish characters. It should be like this:

A,a - B,b - C,c - Ç,ç - D,d - E,e - F,f - G,g - Ğ,ğ - H,h - I,ı - İ,i - J,j - K,k - L,l - M,m - N,n - O,o - Ö,ö - P,p - Q,q - R,r - S,s - Ş,ş - T,t - U,u - Ü,ü - V,v - W,w - X,x - Y,y - Z,z