feat: Translate frontend/src/i18n/en.json in hr

88% of minimum 50% translated source file: 'frontend/src/i18n/en.json'
on 'hr'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

frontend/src/i18n/hr.json

@@ -254,8 +254,8 @@
     "newFile": "Nova datoteka",
     "newFolder": "Nova mapa",
     "preview": "Pregled",
-    "settings": "Settings",
-    "signup": "Signup",
+    "settings": "Postavke",
+    "signup": "Registracija",
     "siteSettings": "Site Settings"
   },
   "success": {