[Enhancement][MangaDex] Inconsistent volume cover art selection when several languages are available

[a-n710]

I have encountered a problem that bugs me every time it happens and decided to go public with it.
I have several coverLanguages selected.

    mangaDex:
      priority: 3
      enabled: true
      coverLanguages:
      - "en"
      - "ja"
      - "ko"
      - "ja-ro"
      - "ko-ro"

I expect that the English cover will be selected, if it is present and only if it is not, I will get a Korean or a Japanese one.

However currently the implementation does not seem to care for the order of languages mentioned in the config and just picks the first one it finds, so frequently I am getting Korean cover instead of an English one.

Hopefully this is not breaking anything and I would appreciate the fix