Editing a gedcom file (.ged)

I need to edit a gedcom file (.ged) and have been told any text editor can do it. I need to input a .ged file, do two “find and replace all” and output a modified .ged file. Secifically i need to replace all occurrences of C’ and c’ with Č and č respectively. . Would someone please tell me if I can use LibreOffice to do this and, if so, provide me with very simple instructions to do this?

RonZ