Je pourrais aussi te parler en français.
But that is not the point. This is an international forum, so we use a lingua franca to communicate. For the contest, this is not applicable, because the lingua franca there is music. For the diversity of the contest different languages are an enrichment. Most of the lyrics are not THAT important, that you ABSOLUTLY need to understand everything. But if I talk to you here, I need to be sure, you can understand me.
Besides, a counter question is not a good argument to the point I made. If a host country should not use a foreign language for their song, the logic would demand, that Austria has chosen a german song. If an english song is acceptable, than a french one would be too.