fix tests and change invitation mechanics

public/js/texts-en.js

@@ -134,7 +134,11 @@ globalThis.Wegwichtel ??= {};
         "ready": "Everything is ready."
       },
       "groups": {
-        "code-wait": "Someone in the group is editing a stop. A new code will appear once the stops are free. An expired code cannot be used to join.",
+        "remaining": "Valid for another {minutes} min {seconds} sec.",
+        "choose-code": "Choose a code",
+        "save-code": "Use this code",
+        "code-expired": "This code has expired. Choose a code to invite others again.",
+        "code-wait": "Someone is editing a stop. Wait until the stops are free before changing the code.",
         "title": "Shared drafts",
         "upload-confirm": "Your draft, including pictures and recordings, will be sent to the website and copied into a shared draft. Continue?",
         "share": "Edit together",
@@ -147,8 +151,7 @@ globalThis.Wegwichtel ??= {};
         "edit": "Edit draft",
         "reload": "Get changes",
         "reload-confirm": "Your unsaved changes will be replaced. Would you like to get the latest shared version?",
-        "new-code": "Show a new code",
-        "new-code-confirm": "The old code will stop working. People who have already joined will keep their access. Create a new code?",
+        "new-code": "Choose a code",
         "close-sharing": "Close group",
         "close-confirm": "The others will no longer be able to open or edit this draft. You will keep your access. Close the group?",
         "expires": "This code works until {time}.",
@@ -157,6 +160,7 @@ globalThis.Wegwichtel ??= {};
         "next": "Next gnome in position {number}",
         "none": "You have not joined a group yet.",
         "error": {
+          "code-taken": "Another group is using this code. Choose different gnomes.",
           "limit": "Close one of your groups before opening another.",
           "full": "This group is full. Ask for a code for another group.",
           "rate": "Please wait a minute and try again.",