Remove the terms blacklist and whitelist from UX (#14149)

Localization strings:

- "Whitelist mode" -> "Limited federation mode"
- "Blacklist e-mail domain" -> "Block e-mail domain"
- "Whitelist domain" -> "Allow domain for federation"

...And so on

Environment variables (backwards-compatible):

- `WHITELIST_MODE` -> `LIMITED_FEDERATION_MODE`
- `EMAIL_DOMAIN_BLACKLIST` -> `EMAIL_DOMAIN_DENYLIST`
- `EMAIL_DOMAIN_WHITELIST` -> `EMAIL_DOMAIN_ALLOWLIST`

tootctl:

- `tootctl domains purge --whitelist-mode` -> `tootctl domains purge --limited-federation-mode`

Removed badly maintained and no longer relevant .env.production.sample file

config/locales/en.yml

@@ -95,7 +95,7 @@ en:
       delete: Delete
       destroyed_msg: Moderation note successfully destroyed!
     accounts:
-      add_email_domain_block: Blacklist e-mail domain
+      add_email_domain_block: Block e-mail domain
       approve: Approve
       approve_all: Approve all
       are_you_sure: Are you sure?
@@ -196,7 +196,7 @@ en:
       username: Username
       warn: Warn
       web: Web
-      whitelisted: Whitelisted
+      whitelisted: Allowed for federation
     action_logs:
       action_types:
         assigned_to_self_report: Assign Report
@@ -241,15 +241,15 @@ en:
         create_account_warning: "%{name} sent a warning to %{target}"
         create_announcement: "%{name} created new announcement %{target}"
         create_custom_emoji: "%{name} uploaded new emoji %{target}"
-        create_domain_allow: "%{name} whitelisted domain %{target}"
+        create_domain_allow: "%{name} allowed federation with domain %{target}"
         create_domain_block: "%{name} blocked domain %{target}"
-        create_email_domain_block: "%{name} blacklisted e-mail domain %{target}"
+        create_email_domain_block: "%{name} blocked e-mail domain %{target}"
         demote_user: "%{name} demoted user %{target}"
         destroy_announcement: "%{name} deleted announcement %{target}"
         destroy_custom_emoji: "%{name} destroyed emoji %{target}"
-        destroy_domain_allow: "%{name} removed domain %{target} from whitelist"
+        destroy_domain_allow: "%{name} disallowed federation with domain %{target}"
         destroy_domain_block: "%{name} unblocked domain %{target}"
-        destroy_email_domain_block: "%{name} whitelisted e-mail domain %{target}"
+        destroy_email_domain_block: "%{name} unblocked e-mail domain %{target}"
         destroy_status: "%{name} removed status by %{target}"
         disable_2fa_user: "%{name} disabled two factor requirement for user %{target}"
         disable_custom_emoji: "%{name} disabled emoji %{target}"
@@ -350,12 +350,12 @@ en:
       week_interactions: interactions this week
       week_users_active: active this week
       week_users_new: users this week
-      whitelist_mode: Whitelist mode
+      whitelist_mode: Limited federation mode
     domain_allows:
-      add_new: Whitelist domain
-      created_msg: Domain has been successfully whitelisted
-      destroyed_msg: Domain has been removed from the whitelist
-      undo: Remove from whitelist
+      add_new: Allow federation with domain
+      created_msg: Domain has been successfully allowed for federation
+      destroyed_msg: Domain has been disallowed from federation
+      undo: Disallow federation with domain
     domain_blocks:
       add_new: Add new domain block
       created_msg: Domain block is now being processed
@@ -398,16 +398,16 @@ en:
       view: View domain block
     email_domain_blocks:
       add_new: Add new
-      created_msg: Successfully added e-mail domain to blacklist
+      created_msg: Successfully blocked e-mail domain
       delete: Delete
-      destroyed_msg: Successfully deleted e-mail domain from blacklist
+      destroyed_msg: Successfully unblocked e-mail domain
       domain: Domain
-      empty: No e-mail domains currently blacklisted.
+      empty: No e-mail domains currently blocked.
       from_html: from %{domain}
       new:
         create: Add domain
-        title: New e-mail blacklist entry
-      title: E-mail blacklist
+        title: Block new e-mail domain
+      title: Blocked e-mail domains
     instances:
       by_domain: Domain
       delivery_available: Delivery is available
@@ -451,7 +451,7 @@ en:
       pending: Waiting for relay's approval
       save_and_enable: Save and enable
       setup: Setup a relay connection
-      signatures_not_enabled: Relays will not work correctly while secure mode or whitelist mode is enabled
+      signatures_not_enabled: Relays will not work correctly while secure mode or limited federation mode is enabled
       status: Status
       title: Relays
     report_notes: