Well, there is something wrong with the ITT's way of adding accelerators, or I have misunderstood something crucial.
Since I got many dupes after using my script, I skip the final step and kept only the conversion to Latin.
So, after that my translation had only Latin characters without accelerators.
I then opened the ITT and ask it to "Re-assign all accelerators"
Keep in mind that my translated parts were some strange words but with normal ASCII characters, no Greek characters at all.
The accelerators were full of dupes again:
ITT 01.png
This menu has 4(!) accelerators at the "r" and 2 at the "e", although there are several more letters to assign..
At this point I give up, because I don't want to fight with Windows, since I don't stand a chance..

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