Remove i18n, keep only Italian and rely on browser translation

The interface was translated in en/it/es/fr via @nuxtjs/i18n. Drop the
module, the locale files, and the language switcher: the UI is now
static Italian text, with translation for foreign visitors left to the
Google Translate browser extension instead of the app.

frontend/app/components/ArticleCard.vue

@@ -3,7 +3,6 @@ import type { ArticleSummary } from '#shared/types/blog'
 
 const props = defineProps<{ article: ArticleSummary }>()
 
-const { locale } = useI18n()
 const mediaUrl = useMediaUrl()
 const cover = computed(() => mediaUrl(props.article.cover))
 </script>
@@ -12,7 +11,7 @@ const cover = computed(() => mediaUrl(props.article.cover))
   <article class="card">
     <!-- No placeholder box when there is no cover: an empty grey rectangle
          reads as a broken image rather than as a deliberate choice. -->
-    <NuxtLinkLocale
+    <NuxtLink
       v-if="cover"
       class="cover-link"
       :to="`/blog/${article.slug}`"
@@ -27,17 +26,17 @@ const cover = computed(() => mediaUrl(props.article.cover))
         :height="article.cover?.height ?? undefined"
         loading="lazy"
       >
-    </NuxtLinkLocale>
+    </NuxtLink>
 
     <p v-if="article.category" class="kicker">{{ article.category.name }}</p>
 
     <h2>
-      <NuxtLinkLocale :to="`/blog/${article.slug}`">{{ article.title }}</NuxtLinkLocale>
+      <NuxtLink :to="`/blog/${article.slug}`">{{ article.title }}</NuxtLink>
     </h2>
 
     <p class="kicker date">
       <time :datetime="isoDate(article.publishedAt)">
-        {{ formatDate(article.publishedAt, locale) }}
+        {{ formatDate(article.publishedAt) }}
       </time>
     </p>
   </article>