feat: add global Komga search autocomplete in header

src/i18n/messages/en/common.json

@@ -454,6 +454,18 @@
     "endOfSeriesMessage": "You have finished all the books in this series!",
     "backToSeries": "Back to series"
   },
+  "header": {
+    "toggleSidebar": "Toggle sidebar",
+    "toggleTheme": "Toggle theme",
+    "search": {
+      "placeholder": "Search series and books...",
+      "empty": "No results",
+      "series": "Series",
+      "books": "Books",
+      "openSeries": "Open series {{title}}",
+      "openBook": "Open book {{title}}"
+    }
+  },
   "navigation": {
     "scrollLeft": "Scroll left",
     "scrollRight": "Scroll right",