Description: Description of luxury resource changes after precisely one is obtained and then it's not clear whether the effect stacks with multiple resources or not.
Steps to Reproduce:

1. While you don't have any copies of a luxury resource (in my case: incense), check the description of it:
   
   It says that the effect is "per Incense"
2. Buy or obtain in other way exactly one copy of the resource, check the description again:
   
    Now everything in the "effects" part of the description is the same (also +5 and +4) with the only difference being that the "per Incense" is gone from it. Now if somebody looked at it they might think that you won't get +10 money for having two, because it just says +5.
   
   3. Buy 2nd copy of that resource:
   
   Now it shows the stacked output, 2*5 money and 2*4 stability.
   
   When you have more than one copy and you remember how much one gives then you can tell that the effect stacks, but if you have just one copy of the resource then it's not clear that you will gain more out of it if you acquire more of it.
   
   

Expected Behavior: When you display the description of a luxury resource that stacks in a case where you already have one (or more) copies of it it should still tell you how much you get per one in addition to the sum you are currently getting. This will let players who have just one copy know that acquiring more copies of the same resource gives them more output.

In other strategy games sometimes having more than one luxury resource doesn't change anything and you can only sell them, so it's not exactly too clear when the description stops showing it.

Attachments: Here is a save file where you are in a situation where you can buy up to 3 copies of Incense from Huns and test, at the beginning you have 0:
English Turn 125_restest.ctr