indexstringtest fails on some systems

[vishakha041]

trafficstars

that do not have the locales used in the test. Could check for the available locales or ask the user for them

[luisremis]

Indexstringtest requires the locale “fr_FR.utf8” to be available on your system.

At line 104 of indexstringtest.cc, we should add

    catch (std::runtime_error e) {
        cout << e.what() << "\n";
        return 1;
    }

-Philip