* I have found that I can select a language in "Data Sources". My issue is that I want two languages there - both Swedish and English.
This controls which language you'd prefer for a show's name and descriptions if it is available. It will always backup to English if your preferred language is not available. (although let us know how well this works as it'll need testing). You can override this setting on a per show/movie basis too.
* Interacting with the Bulk Add Requester (like manually searching for a movie name and selecting one) makes it refresh and start from the very top. Very annoying.
* Selecting "Duplicate Movies" it finds the options where the movie is split into two (CD01/CD02) it's identified as a dupe.
Can you give an example with some filenames please? Does it have 'Multipart movie' set to true? If so these can be filtered out. Right click on the column header
* Movie tags - any chance we could hope for more tags? Resolution would be one I look for.
Resolution is not easy as we need to look into the file to get the resolution. It would make scans very slow - welcome to add it to the ideas wall as a new feature request
* One aspect to have a look at is how to reference things especially in the setting menu; there seems to be a mix of "TV", "TV Show" and "Show". I would favor "TV show" I guess, but most importantly would be consistency here.
I agree "TV Show" is better. I'll start to change it, but any specific changes you note are needed would help