Allow selection, deselection, and multiselection with the spacebar (re: #3843)

Don't open the edit menu on single spacebar press
Open the edit menu for long spacebar press (re: #7577)

data/core.yaml

@@ -1967,6 +1967,7 @@ en:
       enter: Enter
       esc: Esc
       home: Home
+      menu: Menu
       option: Option
       pause: Pause
       pgdn: PgDn

data/shortcuts.json

@@ -107,7 +107,7 @@
             "text": "shortcuts.browsing.selecting.title"
           },
           {
-            "shortcuts": ["Left-click"],
+            "shortcuts": ["Left-click", "shortcuts.key.space"],
             "text": "shortcuts.browsing.selecting.select_one"
           },
           {
@@ -131,7 +131,7 @@
             "text": "shortcuts.browsing.with_selected.title"
           },
           {
-            "shortcuts": ["Right-click", "shortcuts.key.space"],
+            "shortcuts": ["Right-click", "☰"],
             "text": "shortcuts.browsing.with_selected.edit_menu"
           },
           {