I've got about 10 thousand XLSX files that have content in Cyrillic alphabet. I need to transliterate the content of these files into Latin alphabet.
Is there any way to do it with Excel or do I have any other options?
I do not know how it would stand performance-wise, but it can be done to a certain degree with user-defined VBA function, taking the Cyrillic string as argument, iterating through all the characters and replacing each of the Cyrillic letter with the translitterated equivalent, and returning the result.
A quick google search showed me https://gist.github.com/jenikm/3020221 which does the exact reverse of your task, I am sure you could find even more useful material.