feat(FEC-9465): Internationalization (i18n) - player localization

[yairans]

Reverted by cbb59e0. Reopened by #9211.

• Get the i18n from the bundle builder (https://github.com/kaltura/playkit-js-bundle-builder/pull/8)
• push to the mem-cache
• consider nested confvars (see feat(FEC-9465, FEC-9621): Internationalization (i18n) - player localization player-studio#78) like:

{
  "versions": {
    "kaltura-ovp-player": "0.50.9",
    "playkit-vr": "1.1.0"
  },
  "langs": ["fn", "he" ]
}

• filter the languages by this order:
  • new comma separator url param (langs)
  • confvars.langs
  • 'en' by default.
• merge with the uiConf's translations and push to __kalturaplayerdata

---

This change is