Polish folder settings modal

- Increase width to 720px
- Reduce folder name font size to 13px
- Fix button labels (use actions.cancel/save instead of common)
- Add 'saving' i18n key (en/es)
- Wrap long hint texts in <small> tags

src/lib/i18n/locales/en.json

@@ -268,6 +268,7 @@
     "seeAll": "See All",
     "cancel": "Cancel",
     "save": "Save",
+    "saving": "Saving...",
     "delete": "Delete",
     "edit": "Edit",
     "close": "Close",