feat(tables): a glyph pager with first/last, and tablet-width columns step aside

The pager is four named arrows round the page box (first, previous,
next, last). A table hides a tabletHidden column below 64rem of its own
width, as narrowHidden does below 42rem, through one shared helper that
also hides the column's <col>. The Channels table drops Prio, About and
Length there: at 1024 the channel name had 60 px.

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

@@ -6,8 +6,10 @@
   "noOptions": "No options",
   "empty": "Nothing to show.",
   "pager": {
-    "prev": "Previous",
-    "next": "Next",
+    "first": "First page",
+    "prev": "Previous page",
+    "next": "Next page",
+    "last": "Last page",
     "pageLabel": "Page",
     "ofTotal": "of {{total}}"
   }

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

@@ -6,8 +6,10 @@
   "noOptions": "Nincs lehetőség",
   "empty": "Nincs megjeleníthető elem.",
   "pager": {
-    "prev": "Előző",
-    "next": "Következő",
+    "first": "Első oldal",
+    "prev": "Előző oldal",
+    "next": "Következő oldal",
+    "last": "Utolsó oldal",
     "pageLabel": "Oldal",
     "ofTotal": "/ {{total}}"
   }