I've got a nice little idea that I would love to see in the game that literally wouldn't change anything, but would be such a nice thing to have. But first, let's look at these wishes that you wanted feedback on
1. When sending resources to my villages some indicator would be nice how much resource can I store there. (like I have wood: 650/4000, a number would show I can send 3350 wood)
2. At baracks/stable or workshop at the bottom where there is a white space now, the required resource production per hour could be added to see whether I need to level up my barracks for the current production or not for the selected unit. For example: If clubswinger for a given level of barracks takes 30 seconds to produce, there numbers would be there: wood: 10200, clay: 7800, iron: 3600. It would be helpful to balance the level of military building production with resource production fields.
3. Some ROI calculation for the resource fields, I think most of the players thinks higher the better but after level 12 it could take 20-30 days to produce the resources it was invested into the upgrade. Of course this ROI depends on connected oases bonuses, travian plus and resource production bonus buildings.
4. Could the king be allowed to see his/her own kingdom member's troops somehow without using getter tool.
1. I think that this is a neat addition to the game. It saves you the time it takes going back and forth between the villages trying to figure out just how much resources you can send to it, and what it needs at that moment.
2. I feel like this doesn't really feel like it's in the spirit of Travian to be honest. The thing about travian is that it seems simple on the outside but once you get into it, the game gets very complex. Figuring out these things on your own is a part of what makes these games fun to me, and for many these things don't matter at all. They just queue troops up to 100+ hours without thinking about it twice. I think it's better to keep the game looking simple with not necessarily hidden complexity, but rather with parts of it that can be explored and exploited once you start to understand the game at a deeper level.
3. I feel the same way about this as I did in number 2, but I will add that this is just how I feel. I'm not going to be against this feature being added into the game since it is convenient, but this is some of the baseline things to figure out about this game. It's super simple math, and a great starting point before going into more complex stuff. If you do decide to add this, could you add the same feature to resource buildings as well?
4. I think this is fair. The king is the one responsible for the kingdom, so they should have as much information about what's going on in it as possible. If the king can not be trusted, then neither can the kingdom. Maybe make it so that this feature is somehow limited to villages inside of the kingdoms borders?
5. The quality of life thing that I wanted to have added was simply to add a quest for 1,000,000 units. It's not really ever going to be reached, but it's nice to know at the end of a server just how many troops you have trained. Most players will manage to cross the line of 100,000 troops before the server ends, and after that point you don't really have any way of knowing just how much you've actually built. Many troops die in many battles, and it takes a long time to add up everything to figure out the final count. Reward could be anything. Let's just say 0 wood, 0 clay, 0 iron and 1 crop because it sounds fun lol
An alternative to this could be to add it to the statistics page in the form of "My statistics" including stuff like
Troops built:
Troops dead:
Troops killed (off and def):
Troops starved:
And while we are on it we could add stuff like
Current wood/clay/iron/crop production:
Highest wood/clay/iron/crop production achieved:
Total amount of wood/clay/iron/crop produced:
And whatever else could be interesting. Maybe this could be visible somehow for each individual player in the hall of fame part of the lobby somehow? Would be interesting to look at how I've progressed as a travian player going from server to server, and I'd be more able to compare 1 strategy to another, not just between my own servers, but through discussions with other players as well. Graphs for current production and current troops would be cool to look at. I always enjoy looking at it in gettertools, even after a server has ended. It tells a story. 
- Hæim