To choose a shortcut key for a dialog box control (shown as an underlined character on the control's label), you should place the "&" character before a letter in the label.  You may select a letter that makes sense in your local language--you do not have to use the same letter as the English label.  To display the "&" character a dialog box control (e.g. Focal length & barrel correction), double the character:

Original	Translation	Comment
&Vertically symmetric	&Vertikal symmetrisch
Focal length && barrel correction	Brennweitenkorrektur && Tonnenformkorrektur