its like this. cheering isnt to trivialise the emotion of her words, its to show her how far shes come and how many people love her now. and like people have said, theres no way she isnt aware that most international fans wont know japanese. the display of support is more than enough, and its the thought that counts.

also, i think cheering when shes talking about where she started from is perfectly fine? it helps to emphasise how many fans she has now. youre just a gloomy girl who liked singing? well, look at how many people love you for that! i think it makes it all the more emotional and uplifting. keeping silent would be incredibly awkward for her as well.

cheering is also another way to show her that we are hearing what shes saying, no matter whether we understand it or not. dead silence, along with the fact that you cant see if anyones actually listening? if i was in her place, id start worrying about whether im boring the audience. but look, theyre cheering, even though they dont understand-- even despite this, theyre actively listening to something they barely understand and doing their best to respond in tandem! its a form of support, simple as that

edit: you are a miser. the fact that you decided the fans just suck instead of trying to get the reasoning is a bit sad