feat(profile): add username + preferred_locale; wire to Inertia + middleware

- DB: users.username (unique), users.preferred_locale (default from app.locale)
- Backend: validation, model fillable; share supportedLocales; SetLocaleFromUser
- Frontend: profile page fields + types
- Filament: SuperAdmin profile page with username/language

feat(admin-nav): move Tasks to Bibliothek and add menu labels

fix(tasks-table): show localized title/emotion/event type; add translated headers

feat(l10n): add missing table headers for emotions and event types; normalize en/de files

refactor: tidy translations for tasks/emotions/event types

resources/views/filament/resources/emotion-resource/pages/import-emotions.blade.php

@@ -8,7 +8,7 @@
             ]"
         />
          <x-filament::button type="submit" >
-                Import
+                {{ __('admin.common.import') }}
         </x-filament::button>
     </x-filament-panels::form>
 </x-filament-panels::page>

resources/views/filament/resources/task-resource/pages/import-tasks.blade.php

@@ -8,7 +8,7 @@
             ]"
         />
          <x-filament::button type="submit" >
-                Import
+                {{ __('admin.common.import') }}
         </x-filament::button>
     </x-filament-panels::form>
 </x-filament-panels::page>