Notification toasts, nicer loading, add new user support

frontend/src/locale/lang/en.json

@@ -51,6 +51,9 @@
   "notfound.action": "Take me home",
   "notfound.text": "We are sorry but the page you are looking for was not found",
   "notfound.title": "Oops… You just found an error page",
+  "notification.error": "Error",
+  "notification.success": "Success",
+  "notification.user-saved": "User has been saved",
   "offline": "Offline",
   "online": "Online",
   "password": "Password",
@@ -82,6 +85,7 @@
   "user.edit-profile": "Edit Profile",
   "user.full-name": "Full Name",
   "user.logout": "Logout",
+  "user.new": "New User",
   "user.new-password": "New Password",
   "user.nickname": "Nickname",
   "user.switch-dark": "Switch to Dark mode",