Internationalization of AnimeOpenings

[AxelTerizaki]

Kinda related to #305

Having strings in the app translatable could be nice. I wouldn't mind offering a french translation for instance, but right now everything seems hardcoded.

For having internaitonalized my own app Karaoke Mugen and its website, I know this is a real pain and takes a lot of time, so please don't consider this issue a priority at all. I'm opening it because it could be a good idea.

[leonekmi]

This is being worked out here for Karaoke Mugen version. We will soon make a PR.