(etke.cc-exclusive) Server Actions page (#457)

* WIP: add scheduler commands

* refactor scheduler commands page

* WIP on CRUD for ScheduledCommands

* more refactoring, finish CRUD On scheduled pages

* Add info text about Scheduler service

* Finish recurring commands add/edit

* add more texts

* fix server status behavior on not-loaded-yet state; adjust texts; lint fixes

* add link to the help pages in the commands palette

* Move Commands Panel to ServerSchedulesPage

* Rename Server Schedules to Server Actions

* more texts, a bit changed visual of the actions page, lint fix

* add docs

* fix tests

* Add UTC label to scheduled command create/edit

src/i18n/index.d.ts

@@ -473,4 +473,22 @@ interface SynapseTranslationMessages extends TranslationMessages {
       };
     };
   };
+  scheduled_commands?: {
+    action: {
+      create_success: string;
+      update_success: string;
+      update_failure: string;
+      delete_success: string;
+      delete_failure: string;
+    };
+  };
+  recurring_commands?: {
+    action: {
+      create_success: string;
+      update_success: string;
+      update_failure: string;
+      delete_success: string;
+      delete_failure: string;
+    };
+  };
 }