feat: generalize UI wording — Verein→Organisation, Mannschaft→Team

Makes the German UI labels domain-neutral (Verein/Firma both fit "Organisation"),
Mannschaft was pure sports vocabulary and is replaced with Team.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0143yYvjesjHndBACoweyK67

frontend/src/components/dashboard/CreateOrganizationForm.tsx

@@ -61,7 +61,7 @@ export function CreateOrganizationForm() {
   return (
     <Card className="max-w-sm">
       <CardHeader>
-        <CardTitle className="text-lg">Verein anlegen</CardTitle>
+        <CardTitle className="text-lg">Organisation anlegen</CardTitle>
       </CardHeader>
       <CardContent>
         <Form {...form}>
@@ -94,7 +94,7 @@ export function CreateOrganizationForm() {
             />
             {error && <p className="text-sm text-destructive">{error}</p>}
             <Button type="submit" disabled={form.formState.isSubmitting}>
-              {form.formState.isSubmitting ? "Lege an…" : "Verein anlegen"}
+              {form.formState.isSubmitting ? "Lege an…" : "Organisation anlegen"}
             </Button>
           </form>
         </Form>

frontend/src/components/dashboard/DashboardTiles.tsx

@@ -23,7 +23,7 @@ interface TileDef {
 const tileDefs: TileDef[] = [
   { key: "members", label: "Mitglieder", icon: Users, href: "/members" },
   { key: "departments", label: "Abteilungen", icon: Layers, href: "/departments" },
-  { key: "teams", label: "Mannschaften", icon: Shield, href: "/teams" },
+  { key: "teams", label: "Teams", icon: Shield, href: "/teams" },
   { key: "chatRooms", label: "Chatgruppen", icon: MessageSquare },
   { key: "invitations", label: "Einladungen", icon: Mail },
 ];

frontend/src/components/dashboard/OrganizationSwitcher.tsx

@@ -15,17 +15,17 @@ export function OrganizationSwitcher() {
   }
 
   if (error) {
-    return <p className="text-sm text-destructive">Vereine konnten nicht geladen werden</p>;
+    return <p className="text-sm text-destructive">Organisationen konnten nicht geladen werden</p>;
   }
 
   if (organizations.length === 0) {
-    return <p className="text-sm text-muted-foreground">Kein Verein zugeordnet</p>;
+    return <p className="text-sm text-muted-foreground">Keine Organisation zugeordnet</p>;
   }
 
   return (
     <Select value={activeOrganizationId ?? undefined} onValueChange={setActiveOrganizationId}>
       <SelectTrigger className="w-48">
-        <SelectValue placeholder="Verein wählen" />
+        <SelectValue placeholder="Organisation wählen" />
       </SelectTrigger>
       <SelectContent>
         {organizations.map((organization) => (

frontend/src/pages/MembersPage.tsx

@@ -71,7 +71,7 @@ export function MembersPage() {
       </div>
 
       {!activeOrganizationId && (
-        <p className="text-sm text-muted-foreground">Kein Verein ausgewählt.</p>
+        <p className="text-sm text-muted-foreground">Keine Organisation ausgewählt.</p>
       )}
       {error && <p className="text-sm text-destructive">Fehler beim Laden: {error}</p>}
       {statusError && <p className="text-sm text-destructive">{statusError}</p>}

frontend/src/pages/TeamsPage.tsx

@@ -85,7 +85,7 @@ export function TeamsPage() {
   return (
     <main className="min-h-screen p-6 space-y-6">
       <div className="flex items-center justify-between">
-        <h1 className="text-2xl font-semibold">Mannschaften</h1>
+        <h1 className="text-2xl font-semibold">Teams</h1>
         <Button variant="outline" asChild>
           <Link to="/">Zurück zum Dashboard</Link>
         </Button>
@@ -93,7 +93,7 @@ export function TeamsPage() {
 
       <Card className="max-w-lg">
         <CardContent className="pt-6 space-y-3">
-          <Input placeholder="Name der Mannschaft" value={name} onChange={(e) => setName(e.target.value)} />
+          <Input placeholder="Name des Teams" value={name} onChange={(e) => setName(e.target.value)} />
           <div className="flex gap-2">
             <Select value={departmentId} onValueChange={setDepartmentId}>
               <SelectTrigger>
@@ -121,7 +121,7 @@ export function TeamsPage() {
             </Select>
           </div>
           <Button onClick={onCreate} disabled={!name.trim() || !departmentId || !seasonId}>
-            Mannschaft anlegen
+            Team anlegen
           </Button>
           {departments.length === 0 && (
             <p className="text-xs text-muted-foreground">Erst eine Abteilung anlegen.</p>
@@ -137,7 +137,7 @@ export function TeamsPage() {
         {loading ? (
           <p className="text-sm text-muted-foreground">Lädt…</p>
         ) : teams.length === 0 ? (
-          <p className="text-sm text-muted-foreground">Keine Mannschaften</p>
+          <p className="text-sm text-muted-foreground">Keine Teams</p>
         ) : (
           teams.map((team) => (
             <Card key={team.id}>