src/assets: update fi.json5

Add a few Finnish language UI strings.

Author: alanorth

src/assets/i18n/fi.json5

@@ -1922,6 +1922,9 @@
   // "home.breadcrumbs": "Home",
   "home.breadcrumbs": "Etusivu",
 
+  //  "home.search-form.placeholder": "Search the repository ...",
+  "home.search-form.placeholder": "Hae julkaisuarkistosta ...",
+
   // "home.title": "DSpace Angular :: Home",
   "home.title": "DSpace Angular :: Etusivu",
 
@@ -4020,6 +4023,8 @@
   // "search.breadcrumbs": "Search",
   "search.breadcrumbs": "Hae",
 
+  //  "search.search-form.placeholder": "Search the repository ...",
+  "search.search-form.placeholder": "Hae julkaisuarkistosta ...",
 
   // "search.filters.applied.f.author": "Author",
   "search.filters.applied.f.author": "Tekijä",