refactor(settings/general): drop redundant blockquotes, collapse 3 cards into 2

App-title and language sit in one App identity card now (both single-field
sections; separate cards were chrome-heavy). The trivial info blockquotes
that paraphrased the field labels are gone, and the per-field descriptions
on the user creation defaults dropped because the section blockquote
already says when the values apply. The "User creation rules" label is
renamed to "User creation defaults" so the card title matches its scope.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

i18n/default_de.json

@@ -1283,7 +1283,7 @@
   "User can not be registered": "Benutzer kann nicht registriert werden",
   "User can not be updated": "Benutzer kann nicht aktualisiert werden",
   "User created": "Benutzer erstellt",
-  "User creation rules": "Benutzeranlage-Regeln",
+  "User creation defaults": "Standardwerte für Benutzeranlage",
   "User custom fields": "Benutzerzusatzfelder",
   "User deleted": "Benutzer gelöscht",
   "User ID": "Benutzer-ID",

i18n/default_en.json

@@ -1283,7 +1283,7 @@
   "User can not be registered": "User can not be registered",
   "User can not be updated": "User can not be updated",
   "User created": "User created",
-  "User creation rules": "User creation rules",
+  "User creation defaults": "User creation defaults",
   "User custom fields": "User custom fields",
   "User deleted": "User deleted",
   "User ID": "User ID",