New features & important changes

For users

• The search bar now has a button that you can click!
• Youtube URLs can be pasted directly in the search bar. Prepend search query with a backslash (\) to disable that feature (useful if you need to search for a video whose title contains some youtube URL).
• On the channel page the "streams" tab can be sorted by either: "newest", "oldest" or "popular"
• Lots of translations have been updated (thanks to our contributors on Weblate!)
• Videos embedded in local HTML files (e.g: a webpage saved from a blog) can now be played

For instance owners

• Invidious now has the ability to provide a po_token and visitordata to Youtube in order to circumvent current Youtube restrictions.
• Invidious can use an (optional) external signature server like inv_sig_helper. Please note that some videos can't be played without that signature server.
• The Helm charts were moved to a separate repo: https://github.com/iv-org/invidious-helm-chart
• We have changed how containers are released: the latest tag now tracks tagged releases, whereas the master tag tracks the most recent commits of the master branch ("nightly" builds).

For developpers

• The versions of Crystal that we test in CI/CD are now: 1.9.2, 1.10.1, 1.11.2, 1.12.1. Please note that due to a bug in the libxml bindings (See #4256), versions prior to 1.10.0 are not recommended to use.
• Thanks to @syeopite, the code is now ameba compliant.
• Ameba is part of our CI/CD pipeline, and its rules will be enforced in future PRs.
• The transcript code has been rewritten to permit transcripts as a feature rather than being only a workaround for captions. Trancripts feature is coming soon!
• Various fixes regarding the logic interacting with Youtube
• The sort_by parameter can be used on the /api/v1/channels/{id}/streams endpoint. Accepted values are: "newest", "oldest" and "popular"

Bugs fixed

User-side

• Channels: fixed broken "subscribers" and "views" counters
• Watch page: playback position is reset at the end of a video, so that the next time this video is watched, it will start from the beginning rather than 15 seconds before the end
• Watch page: the items in the "add to playlist" drop down are now sorted alphabetically
• Videos: the "genre" URL is now always pointing to a valid webpage
• Playlists: Fixed Could not parse N episodes error on podcast playlists
• All external links should now have the rel attibute set to noreferrer noopener for increased privacy.
• Preferences: Fixed the admin-only "modified source code" input being ignored
• Watch/channel pages: use the full image URL in og:image and twitter:image meta tags

API

• fixed the local parameter not applying to formatStreams on /api/v1/videos/{id}
• fixed an Index out of bounds error hapenning when a playlist had no videos
• fixed duplicated query parameters in proxied video URLs
• Return actual video height/width/fps rather than hard coded values
• Fixed the /api/v1/popular endpoint not returning a proper error code/message when the popular page/endpoint are disabled.

Full list of pull requests merged since the last release (newest first)

• HTML: Sort playlists alphabetically in watch page drop down ([#4853], by @SamantazFox)
• Videos: Fix XSS vulnerability in description/comments ([#4852], thanks anonymous)
• YtAPI: Bump client versions ([#4849], by @SamantazFox)
• SigHelper: Fix inverted time comparison in 'check_update' ([#4845], by @SamantazFox)
• Storyboards: Various fixes and code cleaning ([#4153], by SamantazFox)
• Fix lint errors introduced in #4146 and #4295 ([#4876], thanks @syeopite)
• Search: Add support for Youtube URLs ([#4146], by @SamantazFox)
• Channel: Render age restricted channels ([#4295], thanks @ChunkyProgrammer)
• Ameba: Miscellaneous fixes ([#4807], thanks @syeopite)
• API: Proxy formatStreams URLs too ([#4859], thanks @colinleroy)
• UI: Add search button to search bar ([#4706], thanks @thansk)
• Add ability to set po_token and visitordata ID ([#4789], thanks @unixfox)
• Add support for an external signature server ([#4772], by @SamantazFox)
• Ameba: Fix Naming/VariableNames ([#4790], thanks @syeopite)
• Translations update from Hosted Weblate ([#4659])
• Ameba: Fix Lint/UselessAssign ([#4795], thanks @syeopite)
• HTML: Add rel="noreferrer noopener" to external links ([#4667], thanks @ulmemxpoc)
• Remove unused methods in Invidious::LogHandler ([#4812], thanks @syeopite)
• Ameba: Fix Lint/NotNilAfterNoBang ([#4796], thanks @syeopite)
• Ameba: Fix unused argument Lint warnings ([#4805], thanks @syeopite)
• Ameba: i18next.cr fixes ([#4806], thanks @syeopite)
• Ameba: Disable rules ([#4792], thanks @syeopite)
• Channel: parse subscriber count and channel banner ([#4785], thanks @ChunkyProgrammer)
• Player: Fix playback position of already watched videos ([#4731], thanks @Fijxu)
• Videos: Fix genre url being unusable ([#4717], thanks @meatball133)
• API: Fix out of bound error on empty playlists ([#4696], thanks @Fijxu)
• Handle playlists cataloged as Podcast ([#4695], thanks @Fijxu)
• API: Fix duplicated query parameters in proxied video URLs ([#4587], thanks @absidue)
• API: Return actual stream height, width and fps ([#4586], thanks @absidue)
• Preferences: Fix handling of modified source code URL ([#4437], thanks @nooptek)
• API: Fix URL for vtt subtitles ([#4221], thanks @karelrooted)
• Channels: Add sort options to streams ([#4224], thanks @src-tinkerer)
• API: Fix error code for disabled popular endpoint ([#4296], thanks @iBicha)
• Allow embedding videos in local HTML files ([#4450], thanks @tomasz1986)
• CI: Bump Crystal version matrix ([#4654], by @SamantazFox)
• YtAPI: Remove API keys like official clients ([#4655], by @SamantazFox)
• HTML: Use full URL in the og:image property ([#4675], thanks @Fijxu)
• Rewrite transcript logic to be more generic ([#4747], thanks @syeopite)
• CI: Run Ameba ([#4753], thanks @syeopite)
• CI: Add release based containers ([#4763], thanks @syeopite)
• move helm chart to a dedicated github repository ([#4711], thanks @unixfox)