schematic: fix missing actions strings and hotkey conflict

Fixes: https://gitlab.com/kicad/code/kicad/-/issues/17694
(cherry picked from commit 5ed80a08b8)

Fixes https://gitlab.com/kicad/code/kicad/-/issues/18748

eeschema/tools/ee_actions.cpp

@@ -111,7 +111,7 @@ TOOL_ACTION EE_ACTIONS::selectNode( TOOL_ACTION_ARGS()
 TOOL_ACTION EE_ACTIONS::selectConnection( TOOL_ACTION_ARGS()
         .Name( "eeschema.InteractiveSelection.SelectConnection" )
         .Scope( AS_GLOBAL )
-        .DefaultHotkey( MD_ALT + '4' )
+        .DefaultHotkey( MD_CTRL + '4' )
         .LegacyHotkeyName( "Select Connection" )
         .FriendlyName( _( "Select Connection" ) )
         .Tooltip( _( "Select a complete connection" ) )