feat(localization): expand language support and enhance UI for user settings

- Added support for additional UI locales including Cebuano and Spanish, improving accessibility for a broader user base.
- Updated language selection components in the AppHeader and SettingsWidget to reflect new language options, enhancing user experience.
- Enhanced localization of various UI elements across components, ensuring consistent language representation and improved user engagement.
- Implemented logic to synchronize user language preferences with backend settings, providing a seamless experience when changing languages.

frontend/src/components/DashboardWidget.vue

@@ -5,12 +5,12 @@
     :data-widget-id="widgetId"
   >
     <header class="dashboard-widget__titlebar">
-      <span class="dashboard-widget__drag-handle" title="Verschieben" draggable="true" @dragstart="onDragStart" @dragend="onDragEnd">⋮⋮</span>
+      <span class="dashboard-widget__drag-handle" :title="$t('widgets.dashboard.dragHandle')" draggable="true" @dragstart="onDragStart" @dragend="onDragEnd">⋮⋮</span>
       <span class="dashboard-widget__title">{{ title }}</span>
       <slot name="title-actions"></slot>
     </header>
     <div class="dashboard-widget__frame">
-      <div v-if="loading" class="dashboard-widget__state">Laden…</div>
+      <div v-if="loading" class="dashboard-widget__state">{{ $t('widgets.dashboard.loading') }}</div>
       <div v-else-if="error" class="dashboard-widget__state dashboard-widget__error">{{ error }}</div>
       <div v-else class="dashboard-widget__body">
         <component :is="widgetComponent" :data="data" />