mention Romanian translation, fix reference to error message

README.md

@@ -33,6 +33,7 @@ As of the time of this writing the following translations exist:
  * Chinese (simplified)
  * German
  * Korean
+ * Romanian
  * Russian
  * Spanish
 

src/views/messages-view.jsx

@@ -663,7 +663,7 @@ class MessagesView extends React.Component {
   handleAttachFile(file) {
     if (file.size > MAX_EXTERN_ATTACHMENT_SIZE) {
       // Too large.
-      this.props.onError(this.props.intl.formatMessage(messages.file_attachment_too_large,
+      this.props.onError(this.props.intl.formatMessage('file_attachment_too_large',
           {size: bytesToHumanSize(file.size), limit: bytesToHumanSize(MAX_EXTERN_ATTACHMENT_SIZE)}), 'err');
     } else {
       this.setState({ docPreview: {