Core

• [extractor/common] Improve Akamai HTTP format extraction
  • Allow m3u8 manifest without an additional audio format
  • Fix extraction for qualities starting with a number

Extractors

• [teachable:course] Improve extraction (#24507, #27286)
• [nrk] Improve error extraction
• [nrktv:series] Improve extraction (#21926)
• [nrktv:season] Improve extraction
• [nrk] Improve format extraction and geo-restriction detection (#24221)
• [pornhub] Handle HTTP errors gracefully (#26414)
• [nrktv] Relax URL regular expression (#27299, #26185)

• [zdf] Extract webm formats (#26659)
• [gamespot] Extract DASH and HTTP formats
• [tver] Add support for tver.jp (#26662, #27284)
• [pornhub] Add support for pornhub.org (#27276)