Auto merge of #1681 - paragonie-scott:patch-1, r=str4d

Metrics - Don't exclaim unless > 1

"You have validated 0 transactions!" sounds a little less enthusiastic that intended. This uses a period instead.

After patch, it also says "a transaction".

src/metrics.cpp

@@ -145,7 +145,14 @@ int printMetrics(size_t cols, int64_t nStart, bool mining)
     std::cout << strDuration << std::endl;
     lines += (strDuration.size() / cols);
 
-    std::cout << "- " << strprintf(_("You have validated %d transactions!"), transactionsValidated.get()) << std::endl;
+    int validatedCount = transactionsValidated.get();
+    if (validatedCount > 1) {
+      std::cout << "- " << strprintf(_("You have validated %d transactions!"), validatedCount) << std::endl;
+    } else if (validatedCount == 1) {
+      std::cout << "- " << _("You have validated a transaction!") << std::endl;
+    } else {
+      std::cout << "- " << _("You have validated no transactions.") << std::endl;
+    }
 
     if (mining && loaded) {
         double solps = uptime > 0 ? (double)solutionTargetChecks.get() / uptime : 0;