i18n

- Eliminated StringTable.{h,cpp}.
- Eliminated strings.<locale> files.  This is not the way to do it.

src/command.cpp

@@ -2497,7 +2497,7 @@ void handleShell ()
 
         catch (...)
         {
-          std::cerr << context.stringtable.get (100, "Unknown error.") << "\n";
+          std::cerr << "Unknown error." << "\n";
         }
       }
     }