Chinese translation doesn't work.

[grandpignon]

Firstly great card!
During config found that chinese translation doesn't work(seems didn't work from the beginning as there was another closed bug report without detail).
After checking code and debug I believe this is due to the wrong translation file name "cn.json", it should be "zh.json" instead as the language code is zh.
According to localize.ts L78-L86 the language could be acquired from either HA LocalStroage or Navigator config, I checked both of them and all of them were "zh"

Another point is with HA Local Storage, for chinese language, the field selectedLanguage will be "zh-Hans" but no simply “zh”. According to the code this field will be take with 1st order when parsing, and it only replace '" and -, the result will still be wrong(as there 's no a zhHans.json in translation folder, it will fallback to ENG in next code L90-L94).

Hope I clearly describe the problem, if any detail missed i'll add.

Btw, is it possible to add a param "language" so people can assign manually a specific language?

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