@tatjana This is such a useful hint, would it be a good idea to put it in the "Really useful.." thread?
The first has finished on live broadcast, may be available on line, not sure if it's on International. 35Diwrnod, 2nd(?) series, is currently on but nearing its end. Very convoluted plot lines and very dark 'feel'. Y Gwyll, 3rd series, now starting in English as Hinterland and likely not available in either language until all those episodes have aired, unless it's still on line. Have heard it's hard to get DVDs in Welsh.
To @Mihil I like your idea. we have various threads for different programs and general one which tend to get taken over by what is 'trending'. You could ask about the sort of programs you choose to watch in any language, what interests you!