feat: manage restrictions in console (#6965)

* feat: return 404 or 409 if org reg disallowed

* fix: system limit permissions

* feat: add iam limits api

* feat: disallow public org registrations on default instance

* add integration test

* test: integration

* fix test

* docs: describe public org registrations

* avoid updating docs deps

* fix system limits integration test

* silence integration tests

* fix linting

* ignore strange linter complaints

* review

* improve reset properties naming

* redefine the api

* use restrictions aggregate

* test query

* simplify and test projection

* test commands

* fix unit tests

* move integration test

* support restrictions on default instance

* also test GetRestrictions

* self review

* lint

* abstract away resource owner

* fix tests

* configure supported languages

* fix allowed languages

* fix tests

* default lang must not be restricted

* preferred language must be allowed

* change preferred languages

* check languages everywhere

* lint

* test command side

* lint

* add integration test

* add integration test

* restrict supported ui locales

* lint

* lint

* cleanup

* lint

* allow undefined preferred language

* fix integration tests

* update main

* fix env var

* ignore linter

* ignore linter

* improve integration test config

* reduce cognitive complexity

* compile

* fix(console): switch back to saved language

* feat(API): get allowed languages

* fix(console): only make allowed languages selectable

* warn when editing not allowed languages

* feat: manage restrictions in console

* check for duplicates

* remove useless restriction checks

* review

* revert restriction renaming

* manage languages

* fix language restrictions

* lint

* generate

* allow custom texts for supported langs for now

* fix tests

* cleanup

* cleanup

* cleanup

* lint

* unsupported preferred lang is allowed

* fix integration test

* allow unsupported preferred languages

* lint

* fix languages lists

* simplify default language selection

* translate

* discard

* lint

* load languages for tests

* load languages

* lint

* cleanup

* lint

* cleanup

* get allowed only on admin

* cleanup

* reduce flakiness on very limited postgres

* simplify langSvc

* refactor according to suggestions in pr

* lint

* improve ux

* update central allowed languages

* set first allowed language as default

* readd lost translations

* disable sorting disallowed languages

* fix permissions

* lint

* selectionchange for language in msg texts

* initialize login texts

* init message texts

* lint

* fix drag and drop list styles

* start from 1

* cleanup

* prettier

* correct orgdefaultlabel

* unsubscribe

* lint

* docs: describe language settings

---------

Co-authored-by: peintnermax <max@caos.ch>

docs/docs/guides/manage/customize/texts.md

@@ -49,6 +49,17 @@ ZITADEL is available in the following languages
 - Russian (ru)
 - Dutch (nl)
 
-A language is displayed based on your agent's language header. The default language is English.
+A language is displayed based on your agent's language header.
+If a users language header doesn't match any of the supported or [restricted](#restrict-languages) languages, the instances default language will be used.
 
 If you need support for a specific language we highly encourage you to [contribute translation files](https://github.com/zitadel/zitadel/blob/main/CONTRIBUTING.md) for the missing language.
+
+## Restrict Languages
+
+If you only want to enable a subset of the supported languages, you can configure the languages you'd like to allow using the [restrictions API](./restrictions.md).
+The login UI and notification messages are only rendered in one of the allowed languages and fallback to the instances default language.
+Also, the instances OIDC discovery endpoint will only list the allowed languages in the *ui_locales_supported* field.
+
+All language settings are also configurable in the consoles *Languages* instance settings.
+
+![Languages](/img/guides/console/languages.png)