feat(server): library cleanup from ui (#16226)

* feat(server,web): scan all libraries from frontend

* feat(server,web): scan all libraries from frontend

* Add button text

i18n/en.json

@@ -96,7 +96,7 @@
     "library_scanning_enable_description": "Enable periodic library scanning",
     "library_settings": "External Library",
     "library_settings_description": "Manage external library settings",
-    "library_tasks_description": "Perform library tasks",
+    "library_tasks_description": "Scan external libraries for new and/or changed assets",
     "library_watching_enable_description": "Watch external libraries for file changes",
     "library_watching_settings": "Library watching (EXPERIMENTAL)",
     "library_watching_settings_description": "Automatically watch for changed files",
@@ -336,6 +336,7 @@
     "untracked_files": "Untracked Files",
     "untracked_files_description": "These files are not tracked by the application. They can be the results of failed moves, interrupted uploads, or left behind due to a bug",
     "user_cleanup_job": "User cleanup",
+    "cleanup": "Cleanup",
     "user_delete_delay": "<b>{user}</b>'s account and assets will be scheduled for permanent deletion in {delay, plural, one {# day} other {# days}}.",
     "user_delete_delay_settings": "Delete delay",
     "user_delete_delay_settings_description": "Number of days after removal to permanently delete a user's account and assets. The user deletion job runs at midnight to check for users that are ready for deletion. Changes to this setting will be evaluated at the next execution.",
@@ -1114,6 +1115,7 @@
   "say_something": "Say something",
   "scan_all_libraries": "Scan All Libraries",
   "scan_library": "Scan",
+  "rescan": "Rescan",
   "scan_settings": "Scan Settings",
   "scanning_for_album": "Scanning for album...",
   "search": "Search",