Did I mess up my personal statement? Watch
I'm no expert on personal statements, let alone those based on languages, but I don't think it seems to be a bad approach. You discussed areas you're interested in, why would that be bad?
The personal statement is used to give a summary and a taster of some of your current ideas on things, and in your case, this should be the ideas and personal views on the things you've read or watched or listened to. As you've just summed up what you've looked at it certainly will make your personal statement weaker than what it could be, but by no means is it the end of the world.
Personal statement is a relatively low priority for Oxford, I hear. Besides, if one aspect of your application is weak it's usually not a problem. Actual academic performance will be a much bigger factor.