Translate Error messages in main().

src/main.cpp

@@ -17,6 +17,7 @@
 #include "options.hpp"
 
 #include <boost/locale/generator.hpp>
+#include <boost/locale/message.hpp>
 #include <boost/program_options/errors.hpp>
 #include <boost/program_options/variables_map.hpp>
 
@@ -31,6 +32,7 @@ int main(int argc, char *argv[])
 {
     namespace po = boost::program_options;
 
+    using boost::locale::translate;
     using std::cerr;
     using std::cout;
 
@@ -48,7 +50,8 @@ int main(int argc, char *argv[])
     }
     catch (std::exception &e)
     { // Exceptions we can't recover from or ones we don't know.
-        cerr << "ERROR: " << e.what() << '\n';
+        cerr << translate("ERROR: ") << e.what() << '\n';
+        cerr << translate("Error while parsing options.") << '\n';
         return EXIT_FAILURE;
     }