actually language matter is important although yes, it's very easy to overlook it if you get used in western/european society which have an interchangeable society; but globally, english = easier to market. Here I'm talking about the leagues components and their local national press, which serves as the source of the global marketing for the respective leagues. A league is easier to market when everyone from the FA to the ball boy and their local media able to communicate in a global language.
an easy example is something like this : 30 sul campo vs 30 on the pitch; do you think which one is easier to market to the global audience?
another example is this juventuz forum, it's quite a no brainer to bet that this forum will still get more global members due to the use of english as the main language than if it use chinese even if someone thrown 1 million euro to advertise that chinese forum; and if someone advertise something to you with a language you don't understand, will you get attracted to it? maybe yes if he have no competition, but what if someone else do similar advertising with a language you do understand? I bet you will be naturally leaning to the 2nd guy, even if in truth the 1st guy have better products.
translated communication means additional overhead, 'burden' if you may say so, it can mean more time, more effort and more cost to to do business.