Different ships are voiced in JP vs CN. Ships like Bismarck, Andrea Doria, Essex, Nelson, Gearing have JP va, but lack CN ones. Likewise, ships like Richelieu and Yat Sen have CN voices but not JP ones. JP has no MVP lines, and also lacks some marriage lines that are voiced in Chinese, but I'm almost inclined to believe that there is more JP voices overall given the number of ships I've come across that are voiced in JP but not CN.
Yeah MF seems to be pretty selective with which ships and lines are voiced. It's understandable given that some of the secretary lines (more likely than not the marriage ones) can get pretty lengthy in Chinese.
As an update to this, you can check the Chinese wiki to see they have started uploading audio samples and it is very clear that while some ships are exclusively voiced in one language or the other, the Chinese VO's have many more lines almost completing the character's full voice list whereas JP voices only cover the basics.
I'm sure this will change in the future but something to keep in mind if you are looking for more variety in voices.
1. Go to Dormitory. Click on the bottom right tab to open the menu and select "仓库". It'll take you to a list of your current furnitures not in use.
2. There should be a blue column on the right side with 3 large rectangular buttons. Click the third button "家具回收" and it'll open a smaller UI indicating 3 - 6 stars (which rarity of furniture you want to recycle).
3. Choose which rarity you want to recycle and the furniture list will automatically be filtered to that rarity. Clicking on designated furnitures now will mark them with a number. You will need to recycle X number of furniture to get one box, with X being 4 for 3-star, 3 for 4-star, 2 for 5-star, or 1 for 6-star furniture. This is indicated by a 0/X on the top of the screen depending on which rarity you've selected. The number right below it starts at 0 and indicates how many boxes you will get with the current number of furniture you have chosen to recycle.
4. Click "确定" at the right to recycle.
Haven't done partial recycles so don't know what happens.
Yes, but keep in mind that the chances of getting a 5-star furniture or higher are ~13.4% for premium boxes according to their most recently published rates, and presumably even less for the normal boxes that you get for recycling. 珍藏 = "premium" boxes that you buy from market with higher rates of getting rarer items. 藏品 = normal boxes obtained in game without use of premium currency. There's a good chance that the box you get for trading in a 6-star furniture will have a common 3-star furniture, so it's ill-advised to trade in higher rarity furnitures for boxes unless you really hate having duplicates of them.