Inserting text from external TXT (UTF-8) file between slides, macro modification

I have a list of Polish words written exactly like this in the txt file:
arbuz
bąk
chór
cielę
ćma
dłoń
dżdżownica
dżungla
dźwig

I wish:

1. that there be a separate slide on each of these words
2. that the slides are created between already existing slides (1. old slide - new slide "arbuz", 2. old slide - new slide - "bąk", 3. old slide - new slide "chór", etc.)
3. that each word is in the middle of the slide
4. so that I can define the same font size every new slide should have the same font I defined)
5. it would properly import Polish characters

I found this macro:

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Unfortunately, it only meets conditions 1) and 3). Moreover, it does not support Polish characters (UTF-8). How can I modify this macro?