Fix placeholder text of various empty tables and lists

dashboard/public/translation/en.json

@@ -217,7 +217,7 @@
             "name": "Name",
             "users": "Users",
             "externalLdapTooltip": "From external LDAP directory",
-            "emptyPlaceholder": "No groups available"
+            "emptyPlaceholder": "No Groups"
         },
         "settings": {
             "title": "User Settings",
@@ -552,10 +552,10 @@
         },
         "listing": {
             "title": "Listing",
-            "noBackups": "No backups have been made yet.",
+            "noBackups": "No Backups",
             "contents": "Contents",
             "version": "Version",
-            "noApps": "No apps",
+            "noApps": "No Apps",
             "appCount": "{{ appCount }} apps",
             "tooltipDownloadBackupConfig": "Download Config",
             "cleanupBackups": "Cleanup Backups",
@@ -2010,7 +2010,8 @@
         "editVolumeDialog": {
             "title": "Edit volume {{ name }}"
         },
-        "editActionTooltip": "Edit Volume"
+        "editActionTooltip": "Edit Volume",
+        "emptyPlaceholder": "No Volumes"
     },
     "newLoginEmail": {
         "subject": "[<%= cloudron %>] New login on your account",
@@ -2071,7 +2072,7 @@
     },
     "archives": {
         "listing": {
-            "placeholder": "No archived apps"
+            "placeholder": "No Archived Apps"
         }
     },
     "backup": {
@@ -2102,7 +2103,8 @@
         "passwordToken": "Password/Token",
         "dialog": {
             "title": "Docker Registry"
-        }
+        },
+        "emptyPlaceholder": "No Docker Registries"
     },
     "dockerRegistres": {
         "removeDialog": {