fix(feed): don't tell people to click an indicator that isn't a button

The saved pip borrowed the bookmark button's label, so it read "Saved —
click to remove" on a plain span: hover, be told to click, click, nothing.
It gets its own "Saved" string. The status markers drop their sr-only
twin too — with a title already carrying the meaning, a screen reader
that surfaces title text said it twice.

frontend/src/i18n/locales/en/card.json

@@ -4,6 +4,7 @@
   "watchedUnmark": "Watched — click to unmark",
   "markWatched": "Mark watched",
   "savedRemove": "Saved — click to remove",
+  "savedMark": "Saved",
   "saveForLater": "Save for later",
   "unhide": "Unhide",
   "hide": "Hide",

frontend/src/i18n/locales/hu/card.json

@@ -4,6 +4,7 @@
   "watchedUnmark": "Megnézve — kattints a visszavonáshoz",
   "markWatched": "Megnézettnek jelöl",
   "savedRemove": "Mentve — kattints az eltávolításhoz",
+  "savedMark": "Mentve",
   "saveForLater": "Mentés későbbre",
   "unhide": "Megjelenítés",
   "hide": "Elrejtés",