1.2.7: IT-Tools installable, catalog categories and release notes

- IT-Tools has the template the menu installs from, so it is offered
  like the rest of the catalog.
- Every curated application is listed in categories.json, and OpenTask's
  template matches its recipe.
- The texts of the LXC update jobs read correctly in Spanish, German,
  French, Italian, Portuguese and Swedish.
- The release notes count 514 applications and credit PRs #526, #527,
  #529 and #530.

oci/catalog/index.json

@@ -6793,8 +6793,17 @@
       "replaces_discovered_ids": [],
       "curated_path": "catalog/curated/it-tools.json",
       "template_id": "image-it-tools",
-      "template": null,
-      "template_status": null
+      "template": "apps/it-tools.json",
+      "template_status": "generated-unvalidated",
+      "automatic_install_candidate": true,
+      "untranslated_blockers": [],
+      "requires_privileged_lxc": false,
+      "optional_privileged_lxc": false,
+      "requires_host_pid_namespace": false,
+      "requires_relaxed_confinement": false,
+      "optional_relaxed_confinement": false,
+      "requires_security_confirmation": false,
+      "hidden": false
     },
     {
       "id": "jackett",