feat(player): the big view's bar is glyphs only, and its way out stays in sight

On an iPad the bar's labelled row outgrew the screen and its last control,
leaving the big view, scrolled off the right. Every control is its glyph
now, named by its label and tooltip as in the windowed player; the controls
scroll on a narrow window while fullscreen and leave stay pinned right.

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

@@ -45,7 +45,6 @@
   "channel": "Channel",
   "views": "{{formattedCount}} views",
   "stream": "stream",
-  "watched": "Watched",
   "markWatched": "Mark watched",
   "watchedUnmark": "Watched — click to unmark",
   "jumpToTime": "Jump to this time",

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

@@ -45,7 +45,6 @@
   "channel": "Csatorna",
   "views": "{{formattedCount}} megtekintés",
   "stream": "élő adás",
-  "watched": "Megtekintve",
   "markWatched": "Megtekintettnek jelöl",
   "watchedUnmark": "Megtekintve — kattints a jelölés visszavonásához",
   "jumpToTime": "Ugrás erre az időpontra",