Fix #7903

* Re-add follow recommendations API

    GET /api/v1/suggestions

Removed in 8efa081f21 due to Neo4J
dependency. The algorithm uses triadic closures, takes into account
suspensions, blocks, mutes, domain blocks, excludes locked and moved
accounts, and prefers more recently updated accounts.

* Track interactions with people you don't follow

Replying to, favouriting and reblogging someone you're not following
will make them show up in follow recommendations. The interactions
have different weights:

- Replying is 1
- Favouriting is 10 (decidedly positive interaction, but private)
- Reblogging is 20

Following them, muting or blocking will remove them from the list,
obviously.

* Remove triadic closures, ensure potential friendships are trimmed

* Make embeds cacheable by reverse proxy

* Make follow button on embeds open remote follow modal

Instead of web+mastodon://, also, turn the button blue, and add a
sign up prompt to the remote follow modal

`@signature_verification_failure_reason` is used in most places but`@signed_verification_failure_reason` appears in two places. Likely those errors are not returned.

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>

If Mastodon accesses to the hidden service via transparent proxy, it's needed to avoid checking whether it's a private address, since `.onion` is resolved to a private address.
I was previously using the `HIDDEN_SERVICE_VIA_TRANSPARENT_PROXY` to provide that function. However, I realized that using `HIDDEN_SERVICE_VIA_TRANSPARENT_PROXY` is redundant, since this specification is always used with `ALLOW_ACCESS_TO_HIDDEN_SERVICE`. Therefore, I decided to integrate the setting of `HIDDEN_SERVICE_VIA_TRANSPARENT_PROXY` into` ALLOW_ACCESS_TO_HIDDEN_SERVICE`.

* Add keyword filtering

    GET|POST       /api/v1/filters
    GET|PUT|DELETE /api/v1/filters/:id

- Irreversible filters can drop toots from home or notifications
- Other filters can hide toots through the client app
- Filters use a phrase valid in particular contexts, expiration

* Make sure expired filters don't get applied client-side

* Add missing API methods

* Remove "regex filter" from column settings

* Add tests

* Add test for FeedManager

* Add CustomFilter test

* Add UI for managing filters

* Add streaming API event to allow syncing filters

* Fix tests

* Translated using Weblate (Basque)

Currently translated at 100.0% (623 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/eu/

* Translated using Weblate (Galician)

Currently translated at 100.0% (623 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/gl/

* Translated using Weblate (Galician)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/gl/

* Translated using Weblate (German)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/de/

* Translated using Weblate (German)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/de/

* Translated using Weblate (Persian)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fa/

* Translated using Weblate (Basque)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/eu/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/zh_Hant/

* Translated using Weblate (Japanese)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/ja/

* Translated using Weblate (German)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/de/

* Translated using Weblate (German)

Currently translated at 99.6% (621 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/de/

* Translated using Weblate (Slovak)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/sk/

* Translated using Weblate (Dutch)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/nl/

* Translated using Weblate (Telugu)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/te/

* Translated using Weblate (Slovak)

Currently translated at 96.6% (602 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/sk/

* Translated using Weblate (Catalan)

Currently translated at 99.8% (622 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ca/

* Translated using Weblate (Chinese (Hong Kong))

Currently translated at 99.1% (618 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/zh_Hant_HK/

* Translated using Weblate (Chinese (Hong Kong))

Currently translated at 99.6% (306 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/zh_Hant_HK/

* Translated using Weblate (Chinese (Hong Kong))

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/zh_Hant_HK/

* Translated using Weblate (Malay)

Currently translated at 0.4% (3 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ms/

* Translated using Weblate (Occitan)

Currently translated at 99.8% (622 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/oc/

Work in Progress

* Translated using Weblate (French)

Currently translated at 94.3% (67 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fr/

* Translated using Weblate (French)

Currently translated at 94.3% (67 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fr/

* Translated using Weblate (French)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fr/

* Translated using Weblate (Slovak)

Currently translated at 97.1% (605 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/sk/

* Translated using Weblate (Dutch)

Currently translated at 100.0% (623 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/nl/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 36.2% (226 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 94.0% (586 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 99.3% (305 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (62 of 62 strings)

Translation: Mastodon/Devise
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/devise/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 96.9% (604 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/zh_Hant/

* Translated using Weblate (Esperanto)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/eo/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (62 of 62 strings)

Translation: Mastodon/Devise
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/devise/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/zh_Hant/

* Translated using Weblate (Chinese (Traditional))

Currently translated at 97.5% (608 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/zh_Hant/

* Translated using Weblate (Italian)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/it/

* Translated using Weblate (Italian)

Currently translated at 84.4% (526 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/it/

* Translated using Weblate (Slovak)

Currently translated at 100.0% (62 of 62 strings)

Translation: Mastodon/Devise
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/devise/sk/

* Translated using Weblate (Slovak)

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/sk/

* Translated using Weblate (Slovak)

Currently translated at 97.1% (605 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/sk/

* Translated using Weblate (Slovak)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/sk/

* Translated using Weblate (Slovak)

Currently translated at 97.2% (606 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/sk/

* yarn manage:translations && i18n-tasks normalize && i18n-tasks remove-unused

"Do not dumb here. Not dumb area here."

While this isn't exactly *wrong*, files uploaded with a “.jpe” extension will
keep that extension, which will often cause them to be served with an
incorrect mimetype.

* return collect response when fail put cache to storage

* cleanup callback

https://blog.heroku.com/rails-asset-pipeline-vulnerability

* Fix lack of height of the getting-started menu. (Fix #7854)

Include the height of navigation bar at the height of getting-started menu.

* Remove item "Security" on the getting-started menu.

ref: #7823

* Translated using Weblate (Dutch)

Currently translated at 100.0% (623 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/nl/

* Translated using Weblate (Japanese)

Currently translated at 99.8% (622 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ja/

* Translated using Weblate (Greek)

Currently translated at 99.6% (621 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/el/

* Translated using Weblate (Japanese)

Currently translated at 92.9% (66 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ja/

* Translated using Weblate (Arabic)

Currently translated at 97.1% (69 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ar/

* Translated using Weblate (Arabic)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ar/

* Translated using Weblate (Catalan)

Currently translated at 99.8% (622 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ca/

* Translated using Weblate (Arabic)

Currently translated at 95.8% (597 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ar/

* Translated using Weblate (Dutch)

Currently translated at 94.3% (67 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/nl/

* Translated using Weblate (Catalan)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ca/

* Translated using Weblate (Greek)

Currently translated at 99.6% (621 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/el/

* Translated using Weblate (Dutch)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/nl/

* Translated using Weblate (Dutch)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/nl/

* Translated using Weblate (Persian)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/fa/

* Translated using Weblate (Korean)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/ko/

* Translated using Weblate (Slovak)

Currently translated at 96.3% (600 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/sk/

* Translated using Weblate (Slovak)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/sk/

* Translated using Weblate (Slovak)

Currently translated at 95.7% (68 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/sk/

* Translated using Weblate (Polish)

Currently translated at 99.8% (622 of 623 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/pl/

* Translated using Weblate (Polish)

Currently translated at 100.0% (71 of 71 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/pl/

* Normalize

* Serialize language into ActivityPub JSON

* Only use contentMap if language is present

* Translated using Weblate (German)

Currently translated at 100.0% (76 of 76 strings)

Translation: Mastodon/Doorkeeper
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/doorkeeper/de/

* Translated using Weblate (Esperanto)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/eo/

* Translated using Weblate (German)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/de/

* Translated using Weblate (German)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/de/

* Translated using Weblate (German)

Currently translated at 99.6% (620 of 622 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/de/

* Translated using Weblate (German)

Currently translated at 95.5% (65 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/de/

* Translated using Weblate (German)

Currently translated at 100.0% (68 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/de/

* Translated using Weblate (Esperanto)

Currently translated at 100.0% (68 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/eo/

* Translated using Weblate (Japanese)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/ja/

* Translated using Weblate (Esperanto)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/eo/

* Translated using Weblate (French)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/fr/

* Translated using Weblate (French)

Currently translated at 100.0% (68 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/fr/

* Translated using Weblate (Occitan)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/oc/

* Translated using Weblate (Basque)

Currently translated at 100.0% (68 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/eu/

* Translated using Weblate (Arabic)

Currently translated at 95.0% (591 of 622 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/ar/

* Translated using Weblate (Arabic)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/ar/

* Translated using Weblate (Slovak)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/sk/

* Translated using Weblate (Basque)

Currently translated at 100.0% (622 of 622 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/eu/

* Translated using Weblate (Italian)

Currently translated at 100.0% (68 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/it/

* Translated using Weblate (Italian)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/it/

* Translated using Weblate (Italian)

Currently translated at 84.5% (526 of 622 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/it/

* Translated using Weblate (Basque)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/eu/

* Translated using Weblate (Galician)

Currently translated at 100.0% (622 of 622 strings)

Translation: Mastodon/Backend
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/backend/gl/

* Translated using Weblate (Galician)

Currently translated at 100.0% (307 of 307 strings)

Translation: Mastodon/React
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/frontend/gl/

* Translated using Weblate (Galician)

Currently translated at 100.0% (68 of 68 strings)

Translation: Mastodon/Preferences
Translate-URL: https://weblate.joinmastodon.org/projects/mastodon/simple_form/gl/

* yarn manage:translations && i18n-tasks normalize && i18n-tasks remove-unused

* Update for #7828

Allow selecting default posting language instead of auto-detect

* Update for #7828 and #7823

Allow selecting default posting language instead of auto-detect
Change language opt-out to language opt-in

* Allow selecting default posting language instead of auto-detect

* Enable default language setting in credentials API

* Fix form saving

* Switch filtered_languages to chosen_languages

* Adjust interface

* Remove unused translations

Fix #7820