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/apps/opentask.json

@@ -220,6 +220,10 @@
     },
     "installer_profile": {
       "generated_sensitive_environment": {},
+      "volume_owner": {
+        "uid": 1000,
+        "gid": 1000
+      },
       "volume_preparations": [
         {
           "container_path": "/data",