Add Russian translation (ru) (#1023)

* Add Russian translation (ru)

* Fix a missing comma

* Fix the wording for better consistency

app/assets/javascripts/components/locales/index.jsx

@@ -7,6 +7,8 @@ import pt from './pt';
 import uk from './uk';
 import fi from './fi';
 import eo from './eo';
+import ru from './ru';
+
 
 const locales = {
   en,
@@ -17,7 +19,9 @@ const locales = {
   pt,
   uk,
   fi,
-  eo
+  eo,
+  ru
+
 };
 
 export default function getMessagesForLocale (locale) {