i18n(posts): route BlogOverview filter strings through translations

Adds 12 new keys (blog_search_*, blog_year_*, blog_upcoming_events,
blog_results_*, blog_filter_reset, blog_no_results, blog_rss_subscribe)
and uses them in place of the hardcoded German strings.

src/components/BlogOverview.svelte

@@ -119,14 +119,14 @@
   {#if searchIndex}
     <div class="mb-4 flex flex-wrap items-center gap-2">
       <label class="relative block w-full sm:max-w-sm">
-        <span class="sr-only">Suche</span>
+        <span class="sr-only">{t(T.blog_search_label)}</span>
         <span class="pointer-events-none absolute top-1/2 left-2 -translate-y-1/2 text-zinc-500">
           <Ico icon="mdi:magnify" class="h-4 w-4" />
         </span>
         <input
           type="search"
           bind:value={query}
-          placeholder="Beiträge durchsuchen…"
+          placeholder={t(T.blog_search_placeholder)}
           class="w-full rounded-sm border border-zinc-300 bg-white py-2 pr-9 pl-8 text-sm focus:border-zinc-500 focus:outline-none"
         />
         {#if query}
@@ -134,7 +134,7 @@
             type="button"
             onclick={() => (query = "")}
             class="absolute top-1/2 right-1.5 -translate-y-1/2 rounded-sm p-1 text-zinc-500 hover:bg-zinc-100 hover:text-zinc-900"
-            aria-label="Suche leeren"
+            aria-label={t(T.blog_search_clear)}
           >
             <Ico icon="mdi:close" class="h-4 w-4" />
           </button>
@@ -142,7 +142,7 @@
       </label>
       {#if availableYears.length > 0}
         <label class="relative inline-flex items-center">
-          <span class="sr-only">Jahr</span>
+          <span class="sr-only">{t(T.blog_year_label)}</span>
           <span class="pointer-events-none absolute top-1/2 left-2 -translate-y-1/2 text-zinc-500">
             <Ico icon="mdi:calendar" class="h-4 w-4" />
           </span>
@@ -150,7 +150,7 @@
             bind:value={year}
             class="appearance-none rounded-sm border border-zinc-300 bg-white py-2 pr-7 pl-8 text-sm focus:border-zinc-500 focus:outline-none"
           >
-            <option value="">Alle Jahre</option>
+            <option value="">{t(T.blog_year_all)}</option>
             {#each availableYears as y}
               <option value={y}>{y}</option>
             {/each}
@@ -167,7 +167,7 @@
     <section class="mb-6 rounded-sm border border-zinc-200 bg-zinc-50 p-4">
       <h2 class="mb-3 flex items-center gap-1.5 text-sm font-semibold tracking-wide text-zinc-700 uppercase">
         <Ico icon="mdi:calendar-clock" class="h-4 w-4" />
-        Nächste Termine
+        {t(T.blog_upcoming_events)}
       </h2>
       <ul class="space-y-2">
         {#each upcomingEvents as ev}
@@ -187,16 +187,15 @@
   {#if isFiltering}
     <div class="mb-3 flex flex-wrap items-center gap-2 text-xs text-zinc-600">
       <span>
-        {filteredResults.length}
-        {filteredResults.length === 1 ? "Treffer" : "Treffer"}
-        {#if query}für „{query}"{/if}
-        {#if year}im Jahr {year}{/if}
+        {t(T.blog_results_count, { count: filteredResults.length })}
+        {#if query}{t(T.blog_results_for, { query })}{/if}
+        {#if year}{t(T.blog_results_in_year, { year })}{/if}
       </span>
       <button
         type="button"
         onclick={() => { query = ""; year = ""; }}
         class="text-zinc-500 underline hover:text-zinc-900"
-      >Filter zurücksetzen</button>
+      >{t(T.blog_filter_reset)}</button>
     </div>
     {#if filteredResults.length > 0}
       <div class="py-2 grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-3">
@@ -218,7 +217,7 @@
       </div>
     {:else}
       <div class="rounded-sm border border-zinc-200 bg-white p-6 text-center text-sm text-zinc-600">
-        Keine Treffer. Versuche einen anderen Suchbegriff.
+        {t(T.blog_no_results)}
       </div>
     {/if}
   {:else}
@@ -295,7 +294,7 @@
   <div class="mt-4 text-xs text-zinc-600">
     <a href="/posts/rss.xml" class="inline-flex items-center gap-1 hover:underline">
       <Ico icon="mdi:rss" class="h-3.5 w-3.5" />
-      RSS-Feed abonnieren
+      {t(T.blog_rss_subscribe)}
     </a>
   </div>
   {/if}

src/lib/translations.ts

@@ -159,6 +159,18 @@ const TRANSLATION_KEYS = [
   "post_map_open_osm",
   "post_map_activate",
   "post_overview_all",
+  "blog_search_label",
+  "blog_search_placeholder",
+  "blog_search_clear",
+  "blog_year_label",
+  "blog_year_all",
+  "blog_upcoming_events",
+  "blog_results_count",
+  "blog_results_for",
+  "blog_results_in_year",
+  "blog_filter_reset",
+  "blog_no_results",
+  "blog_rss_subscribe",
 ] as const;
 
 export type TranslationKey = (typeof TRANSLATION_KEYS)[number];