Remove unused `i18n`

ts/components/conversation/media-gallery/AttachmentListSection.tsx

@@ -46,7 +46,6 @@ export class AttachmentListSection extends React.Component<Props, {}> {
           return (
             <ImageThumbnail
               key={message.received_at}
-              i18n={i18n}
               message={message}
             />
           );

ts/components/conversation/media-gallery/ImageThumbnail.tsx

@@ -6,9 +6,9 @@ import React from 'react';
 import { LoadingIndicator } from './LoadingIndicator';
 import { Message } from './propTypes/Message';
 
+
 interface Props {
   message: Message;
-  i18n: (value: string) => string;
 }
 
 const size = {
@@ -30,7 +30,7 @@ const styles = {
 
 export class ImageThumbnail extends React.Component<Props, {}> {
   public renderContent() {
-    const { /* i18n, */ message } = this.props;
+    const { message } = this.props;
 
     if (!message.objectURL) {
       return <LoadingIndicator />;