fix(ui): a card's Play clears its hover row at a large text size; Downloads links and the player description

At text size 1.3 a 242px feed thumbnail put the 63px Play 13px into the
hover row (the Play grows with the root font, the picture's height does
not). A picture narrower than 14rem centres the Play and the resume pair
above the row; the picture box is a size container for it.

The Downloads title and channel links were 21px tall inline boxes; they
stand on a 24px line now (B1). The player's description says a failed
load, with a retry, instead of 'No description' (both the side panel
and the popover).

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

@@ -23,6 +23,7 @@
   "closeEsc": "Close (Esc)",
   "description": "Description",
   "noDescription": "No description.",
+  "descriptionFailed": "Couldn't load the description",
   "channel": "Channel",
   "views": "{{formattedCount}} views",
   "stream": "stream",

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

@@ -23,6 +23,7 @@
   "closeEsc": "Bezárás (Esc)",
   "description": "Leírás",
   "noDescription": "Nincs leírás.",
+  "descriptionFailed": "Nem sikerült betölteni a leírást",
   "channel": "Csatorna",
   "views": "{{formattedCount}} megtekintés",
   "stream": "élő adás",