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

89% of minimum 50% translated source file: 'frontend/src/i18n/en.json'
on 'sv_SE'.

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

frontend/src/i18n/sv-se.json

@@ -141,7 +141,7 @@
     "show": "Visa",
     "size": "Storlek",
     "upload": "Ladda upp",
-    "uploadFiles": "Uploading {files} files...",
+    "uploadFiles": "Laddar upp {files} filer...",
     "uploadMessage": "Select an option to upload.",
     "optionalPassword": "Optional password",
     "resolution": "Resolution",