Add text-monospace class and apply it to cron, csp and robots inputs

src/theme.scss

@@ -69,6 +69,10 @@ $state-danger-border:                       $brand-danger;
 // Bootstrap extension
 // ----------------------------
 
+.text-monospace {
+    font-family: $font-family-monospace;
+}
+
 .row-same-height {
     height: 100%;
     display: table;