Added multilanguage support

[gigibu5]

What's new:

• Moved configuration to config.php
  • Now you can pull directly, if there is a new version avaliable without backing up your config.
• Added multilanguage support
  • Added some configuration variables to config.php, so that you can customize the UI.
  • In the future, language variables could be moved to a seperate file containing a MAP array, allowing for quick and easy language change.
• Updated README.md
• Created sample-configs directory
  • config-sample.php - a config sample in English language
  • config-sample-si.php - a config sample in Slovenian language
• New theme added
  • Added my personal theme to sample config files (I'm lazy and don't want to back it up 😅)

Thank you for considering this PR.

[lrkrol]

Thanks for the PR @gigibu5 -- I had apparently switched off notifications for this repo and am only now seeing this. Apologies for that.

I like your changes. I did have, however, a specific reason for not having a separate config file: I kinda like the 'one file holds all' philosophy. The player works when all you have is index.php, with everything else (getid3, themes) being optional. Right now, someone would have to manually copy a config from the samples to the root for the player to work. Perhaps we could have a default config in the main file, which is overruled whenever config.php is found?