Better menu item label and tool tip.

Modify incorrect menu label.

Fixes: lp:1733113
https://bugs.launchpad.net/kicad/+bug/1733113

eeschema/menubar.cpp

@@ -623,8 +623,8 @@ static void preparePreferencesMenu( SCH_EDIT_FRAME* aFrame, wxMenu* aParentMenu
     // Library
     AddMenuItem( aParentMenu,
                  ID_EDIT_SYM_LIB_TABLE,
-                 _( "Manage Symbol Libraries" ),
-                 _( "Edit the global and project symbol library tables." ),
+                 _( "Manage Symbol Library Tables" ),
+                 _( "Edit the global and project symbol library tables (list of active libraries)." ),
                  KiBitmap( library_table_xpm ) );
 
     // Options (Preferences on WXMAC)

kicad/menubar.cpp

@@ -403,7 +403,7 @@ void KICAD_MANAGER_FRAME::ReCreateMenuBar()
     msg = AddHotkeyName( _( "Edit Schematic" ), kicad_Manager_Hokeys_Descr, HK_RUN_EESCHEMA );
     AddMenuItem( toolsMenu, ID_TO_SCH, msg, KiBitmap( eeschema_xpm ) );
 
-    msg = AddHotkeyName( _( "Manage Symbol Libraries" ),
+    msg = AddHotkeyName( _( "Edit Schematic Symbols" ),
                          kicad_Manager_Hokeys_Descr, HK_RUN_LIBEDIT );
     AddMenuItem( toolsMenu, ID_TO_SCH_LIB_EDITOR, msg, KiBitmap( libedit_xpm ) );