Add poster translations

[VSeryi]

Overview

This Pull Request introduces a version for Showly 2.0 that allows poster translations to be displayed based on the user's configured language.

It resolved Issues as #797 when a translation is available

Changes

• Changed fetchEpisodeImage method to unify it with the rest of fetch"Media"Image
• Changed the loadRemoteImage of the EpisodeImagesProvider to unify it with the style of the rest of the ImagesProviders.
• Added getVoteScore method in TmdbImage to get a score based on count votes and average votes using wilson's score.
• Changed the findBestImage method to choose the first image in the language selected by the user, or failing that, in English, or failing that, in ‘null’, or failing that, in whatever language there is, all of them sorted by their VoteScore.
• Added clearing of image cache when switching languages

Acknowledgements

A huge thank you to everyone involved in developing Showly 2.0.