Add a lint rule to enforce no more literals in jsx.

src/.eslintrc.js

@@ -11,6 +11,7 @@ module.exports = {
         'import/no-mutable-exports': 'error',
         'import/no-commonjs': 'error',
         'import/no-amd': 'error',
-        'import/no-nodejs-modules': 'error'
+        'import/no-nodejs-modules': 'error',
+        'react/jsx-no-literals': 'error'
     }
 };