Add priority to gotify channel

Closes: #1277

modules/webapp/src/main/elm/Messages/Comp/NotificationGotifyForm.elm

@@ -18,6 +18,8 @@ type alias Texts =
     { basics : Messages.Basics.Texts
     , gotifyUrl : String
     , appKey : String
+    , priority : String
+    , priorityInfo : String
     }
 
 
@@ -26,6 +28,8 @@ gb =
     { basics = Messages.Basics.gb
     , gotifyUrl = "Gotify URL"
     , appKey = "App Key"
+    , priority = "Priority"
+    , priorityInfo = "A number denoting the importance of a message controlling notification behaviour. The higher the more important."
     }
 
 
@@ -34,4 +38,6 @@ de =
     { basics = Messages.Basics.de
     , gotifyUrl = "Gotify URL"
     , appKey = "App Key"
+    , priority = "Priorität"
+    , priorityInfo = "Eine Zahl, um die Wichtigkeit anzugeben (je höher desto wichtiger). Es steuert, wie eine Notifizierung erscheint."
     }